Opera Browser for Android

Research Opera Browser for Android Share May 21st, 2021 In this episode of theOpera Bug Bounty series, we introduce Opera for Android, our main product for the Android platform. What is Opera for Android Opera for Android is a Chromium-based browser that prides itself on a user-friendly and good...

Earn up to $10K from the Opera Bug Bounty program

Security Earn up to $10K from the Opera Bug Bounty program Share April 30th, 2021 Join the Opera Bug Bounty program, find vulnerabilities in scope, tell us how you did it, and collect rewards. We pay up to $10K for confirmed high-value submissions. Opera has two bug bounty programs operated by...

Unjam the logjam

Security Unjam the logjam Share June 9th, 2015 When a browser and website communicate over a secure connection, they encrypt and decrypt the data using a shared symmetric encryption key; the same key is used for encryption and decryption. In order for the browser and server to make sure they use...

File inputs can disclose the path to selected files – Opera Security Advisories

File inputs can disclose the path to selected files – Opera Security Advisories OPCOM Team | June 29, 2010 Severity Less severe Description When a file is selected in a file upload input, the path to that file is not exposed through the input’s value property. This is done to protect any sensitiv...

Opera may allow scripts to access feeds

Opera may allow scripts to run on the feed subscription page, thereby gaining access to the feeds object. This can be used for automatic subscription of feeds, or reading other feeds...

Simulated text inputs can trick users into uploading arbitrary files

When a user types into a file input, scripts can cause some of the keystrokes to be ignored. If the script can convince the user that they are typing into a normal text input, and not let them see that their keystrokes are being ignored, it can cause the input to point to known file paths on the...

Opera's HTTP authentication cuts off long server names at the end

Opera's HTTP authentication dialog is displayed when the user enters a Web pagethat requires a login name and a password. To inform the user which server itwas that asked for login credentials, the dialog displays the server name.The user has to see the entire server name. A truncated name can be...

The createPattern function can reveal old data from random places in memory – Opera Security Advisories

The createPattern function can reveal old data from random places in memory – Opera Security Advisories OPCOM Team | July 19, 2007 Summary The createPattern function can reveal old data from random places in memory Severity: moderately severe Problem description Opera for Linux, FreeBSD, and...

Vulnerability in Opera's use of kfmclient

The kfmclient is a part of the KDE desktop environment.It inspects the file given to it to determine its MIMEtype, and performs the action assigned to that MIME typein KDE's configuration. If the file type is an executable,kfmclient may execute it.Opera will not save downloaded files with the...

Information displayed in the security field should be approached with caution. – Opera Security Advisories

Information displayed in the security field should be approached with caution. – Opera Security Advisories OPCOM Team | February 9, 2007 Summary Even though a Certificate Authority has verified and signed it, a usershould not trust the Organization name without checking the domain name.A fraudule...

(Updated) Specially crafted JPEG images enables the execution of arbitrary code.

A specially crafted JPEG image header can trick Opera into allocatingthe wrong amount of memory for the image. This can make Opera crash,or worse, execute code that has been placed into memory in advance...

Double-clicking a link can run a program from the Internet – Opera Security Advisories

Double-clicking a link can run a program from the Internet – Opera Security Advisories OPCOM Team | December 19, 2005 Summary If a user double-clicks a Web link leading to a program,that program can be run. The second click may go intothe “Open” button of the file download dialog. Severity:...

Specially crafted Java applets can crash Opera – Opera Security Advisories

Specially crafted Java applets can crash Opera – Opera Security Advisories OPCOM Team | November 23, 2005 Summary A specially crafted Java applet can cause Opera to crash. Severity: Not exploitable Problem description Java code using LiveConnect methods to remove a property of aJavaScript object...

Addressing the “CrossBarking” vulnerability discovered in collaboration with Guardio

News, Security Addressing the “CrossBarking” vulnerability discovered in collaboration with Guardio Share October 30th, 2024 Hi Opera users! Over time, we have shared details about how we approach security vulnerabilities, and especially how we work with external security researchers to identify...

Update your browser: Security fixes for latest Chrome zero-day

News, Security Update your browser: Security fixes for latest Chrome zero-day Share January 18th, 2024 Hi everyone! The latest patches to the Opera, Opera GX, Opera Crypto, and Opera for Android browsers address several recent vulnerabilities, including a zero-day exploit CVE-2024-0519. We...

Update your browser: Security fixes for latest Chrome zero-day

News, Security Update your browser: Security fixes for latest Chrome zero-day Share December 22nd, 2023 Hi everyone! The latest patches to the Opera, Opera GX, Opera Crypto, and Opera for Android browsers address several recent vulnerabilities, including a zero-day exploit CVE-2023-7024. We...

Update your browser: Security fixes for latest Chrome bugs

News, Security Update your browser: Security fixes for latest Chrome bugs Share December 1st, 2023 Hi everyone! The latest patches to the Opera, Opera GX, and Opera Crypto browsers address several recent vulnerabilities, including a zero-day exploit CVE-2023-6345. We recommend updating your...

Update your browser: Security fix for latest Chrome zero-day

News, Security Update your browser: Security fix for latest Chrome zero-day Share September 29th, 2023 Hi everyone! Opera browsers have received important updates addressing a number of vulnerabilities and bugs. Among those is the following zero-day vulnerability detected by security researchers,...

How your Opera browser keeps you safe from spyware and other cyber threats

Privacy, Security How your Opera browser keeps you safe from spyware and other cyber threats Share August 11th, 2023 Hi everyone! In our digital age, your online security is often under threat. From phishing scams to spyware and direct hacking attempts, your personal data is often in the crosshai...

Bug Bounty Guest Post: Local File Read via Stored XSS in The Opera Browser

Research Bug Bounty Guest Post: Local File Read via Stored XSS in The Opera Browser Share September 8th, 2021 Opera manages aBug Bounty program where researchers can report vulnerabilities in Opera’s software and be rewarded for it. For high-quality reports, we like to invite researchers to write...

Address bar spoofing in Opera Mini for Android – Opera Security Advisories

Opera Mini for Android before version 52.2 is vulnerable to an address bar spoofing attack. The vulnerability allows a malicious page to trick the browser into showing an address of a different page. This may allow the malicious page to impersonate another page and trick a user into providing...

To VPN or not to VPN?

Security To VPN or not to VPN? Share October 29th, 2020 Alice and Bob use VPN to fight Mallory, an inquisitive sysadmin. TL;DR: skip to the conclusions to see what Alice learned. The Privacy Problem Alice and Bob recently met Mallory, who works at the cable company providing internet access to th...

Security changes in Opera 21

News Security changes in Opera 21 Share May 6th, 2014 Opera 21 for Windows and Mac is now out on the Stable channel. As with most major releases, the main focus is on the new features, which are discussed over on the Desktop Team blog. In addition, we have included a reworking of the Address fiel...

Heartbleed and other heartaches

Security Heartbleed and other heartaches Share April 11th, 2014 As has been reported extensively already, OpenSSL just fixed a serious vulnerability, dubbed Heartbleed. OpenSSL is used in a variety of products used on the internet, including Opera products and servers. We want to share with you h...

Replaced code signing certificate – Opera Security Advisories

Opera Software recently experienced an attack on the internal infrastructure. Following best practices, Opera Software is replacing signing certificates in Opera with newly issued certificates. Certificates in Opera include the code signing certificate for desktop binaries and the signing...

Repeated attempts to access a target site can trigger address field spoofing – Opera Security Advisories

The browser address field should always show the correct address for the page that is currently being displayed. By making repeated requests to load a target site in rapid succession, an attacking web site can cause Opera to display the target sites address while the attacking page is still being...

Specially crafted WebP images can be used to disclose random chunks of memory – Opera Security Advisories

WebP images may be used as fill patterns in a HTML5 Canvas, and the values of each pixel in the image can then be intentionally read using scripts. Specially crafted WebP images may specify the wrong size for certain parts of their data, which causes Opera to read data from the wrong positions in...

Cross domain access to object constructors can be used to facilitate cross-site scripting – Opera Security Advisories

JavaScripts are able to redefine and override the methods of native objects. They may also do this with the native objects of any document that shares the same origin. By redefining the methods of another document through the constructor property of the document’s host objects, a malicious script...

CORS requests can incorrectly retrieve contents of cross origin pages – Opera Security Advisories

CORS Cross-Origin Resource Sharing allows web pages to retrieve the contents of pages from other sites, with their permission, as they would appear for the current user. When requests are made in this way, the browser should only allow the page content to be retrieved if the target site sends the...

A combination of clicks and key presses can lead to cross site scripting or code execution – Opera Security Advisories

When a user double clicks on a page, they may expect the two clicks to target the same object. If a page uses the first click to open a pop-up window in a predictable location, the second click may focus parts of the new window, such as its address field. If the page can then convince the user to...

Cross-domain JSON resources may be exposed as JavaScript variable data – Opera Security Advisories

JSON strings are sometimes exported by sites as a resource that cannot be read cross-domain, and may contain confidential data. The format of a JSON string ensures that it cannot be read as the contents of a variable, if it is included as a normal script. In some cases, Opera does not correctly...

Web page dialogs can be used to to display the wrong address in the address field – Opera Security Advisories

The address field should always show the correct address for the page that is loaded. If a page can cause Opera to display certain dialogs relating to a target site, the dialog may in some cases cause Opera to display the target site’s address instead of the correct address. This can allow an...

TLS protocol vulnerable to Man In The Middle attack – Opera Security Advisories

TLS protocol vulnerable to Man In The Middle attack – Opera Security Advisories OPCOM Team | June 29, 2010 Summary A vulnerability has been discovered in all current versions of the SSL and TLS protocols, that may allow an attacker to inject data and instructions into the HTTPS connection and tri...

Opera may be used as a vector for a font issue in the underlying operating system – Opera Security Advisories

Opera may be used as a vector for a font issue in the underlying operating system – Opera Security Advisories OPCOM Team | June 19, 2010 Affected versions This vulnerability may be targeted through Opera for Windows. Severity Extremely Severe Description A flaw in the font handling on the Windows...

Multiple asynchronous document modifications can be used to execute arbitrary code – Opera Security Advisories

Multiple asynchronous document modifications can be used to execute arbitrary code – Opera Security Advisories OPCOM Team | April 28, 2010 Affected versions This vulnerability affects Opera for Windows and Mac. Severity Extremely Severe Description Multiple asynchronous calls to a script that...

TLS certificates can be used to execute arbitrary code – Opera Security Advisories

TLS certificates can be used to execute arbitrary code – Opera Security Advisories OPCOM Team | February 13, 2009 Severity Highly Severe Problem Description When connecting to a TLS-protected website, Opera parses the X.509 certificate. If a site uses a specially crafted Subject Alternative Name ...

Vulnerability in createSVGTransformFromMatrix (JavaScript, SVG) – Opera Security Advisories

Vulnerability in createSVGTransformFromMatrix JavaScript, SVG – Opera Security Advisories OPCOM Team | December 16, 2008 Summary A vulnerability in createSVGTransformFromMatrix ObjectTypecasting can crash Opera. Severity Moderate Problem description Passing an incorrect object to...

Rich editing allows cross domain scripting

Rich editing using designMode allows page contents to be edited. Pages can use this ability to inject scripts into pages from other domains. This allows cross domain scripting...

Feed links can link to local files

As a security precaution, Opera does not allow Web pages to link to files on the user's local disk. However, a flaw exists that allows Web pages to link to feed source files on the user's computer. Suitable detection of JavaScript events and appropriate manipulation can unreliably allow a script ...

Manipulating text input contents can allow execution of arbitrary code – Opera Security Advisories

Manipulating text input contents can allow execution of arbitrary code – Opera Security Advisories OPCOM Team | December 15, 2008 Severity Extremely Severe Problem Description Manipulating certain text-area contents can cause a buffer overflow, which may be exploited to execute arbitrary code...

Images can be read cross-domain with canvas – Opera Security Advisories

Images can be read cross-domain with canvas – Opera Security Advisories OPCOM Team | June 9, 2008 Severity: Less Severe Problem Description HTML CANVAS elements can use images as patterns, and that image data is made available to scripts. When the images are retrieved from other Web sites, the...

External news readers and e-mail clients can be used to execute arbitrary code – Opera Security Advisories

External news readers and e-mail clients can be used to execute arbitrary code – Opera Security Advisories OPCOM Team | October 16, 2007 External news readers and e-mail clients can be used to execute arbitrary code. Severity: Highly Severe Affected Versions All versions of Opera for Desktop prio...

A very large href attribute value in HTML can crash Opera – Opera Security Advisories

A very large href attribute value in HTML can crash Opera – Opera Security Advisories OPCOM Team | September 5, 2006 Summary A very large href attribute value in a Web page can crash Opera. Severity: Not a security issue Problem description A Web page containing a very large href attribute value...

Combinations of right-to-left text and negative margins can crash Opera – Opera Security Advisories

Combinations of right-to-left text and negative margins can crash Opera – Opera Security Advisories OPCOM Team | November 23, 2005 Summary Combinations of right-to-left text and negative marginsin HTML code can crash Opera. Severity: Not a security issue. Problem description Right-to-left scripts...

Malicious setRequestHeader cross-site vulnerability – Opera Security Advisories

Malicious setRequestHeader cross-site vulnerability – Opera Security Advisories OPCOM Team | September 29, 2005 Summary A malicious setRequestHeader can be used to stealuser credentials and inject cross-site JavaScript. Severity: high Opera’s response Since version 8.02 of Opera, double newlineso...

Internationalized domain names (IDN) can be used for spoofing. – Opera Security Advisories

Internationalized domain names IDN can be used for spoofing. – Opera Security Advisories OPCOM Team | February 25, 2005 Summary Opera supports internationalized domain names IDN, which allowsfor example Russian or Chinese domain names to be written in theirown native scripts. However, this also...

Update your browser: Security fix for Chrome zero-day CVE-2026-5281

News, Security Update your browser: Security fix for Chrome zero-day CVE-2026-5281 Share April 4th, 2026 Hi everyone! The latest patches to Opera’s browsers address several recent vulnerabilities, including a zero-day exploit CVE-2026-5281. We recommend updating your browsers to the latest versio...

Update your browser: Security fix for Chrome zero-day CVE-2025-14174

News, Security Update your browser: Security fix for Chrome zero-day CVE-2025-14174 Share December 18th, 2025 Hi everyone! The latest patches to Opera, Opera GX, Opera Air, and Opera for Android address several recent vulnerabilities, including a zero-day exploit CVE-2025-14174. We recommend...

Update your browser: Security fix for Chrome zero-day CVE-2025-6558

News, Security Update your browser: Security fix for Chrome zero-day CVE-2025-6558 Share July 17th, 2025 Hi everyone! The latest patches to the Opera, Opera GX, and Opera Air address several recent vulnerabilities, including a zero-day exploit CVE-2025-6558. We recommend updating your browsers to...

Update your browser: Security fix for Chrome zero-day CVE-2025-6554

News, Security Update your browser: Security fix for Chrome zero-day CVE-2025-6554 Share July 3rd, 2025 Hi everyone! The latest patches to the Opera, Opera GX, Opera Air, and Opera for Android address several recent vulnerabilities, including a zero-day exploit CVE-2025-6554. We recommend updatin...