The links panel can allow cross-site scripting

The links panel shows links in all frames on the current page, including links with JavaScript URLs. When a page is held in a frame, the script is incorrectly executed on the outermost page, not the page where the URL was located. This can be used to execute scripts in the context of an unrelated...

Malicious setRequestHeader cross-site vulnerability

A malicious setRequestHeader can be used to stealuser credentials and inject cross-site JavaScript...

How Opera for Android’s revamped ad blocker improves your browsing experience

News, Privacy How Opera for Android’s revamped ad blocker improves your browsing experience Share December 11th, 2024 Hi Opera users! At Opera, we know how intrusive advertising can disrupt your browsing experience by turning it into a frustrating maze of pop-ups. That’s why we have included a...

Resolving the “screen capture” notification issue on MacOS Sonoma

News, Privacy Resolving the “screen capture” notification issue on MacOS Sonoma Share October 2nd, 2023 Hey everyone! We recently became aware of an issue that appears for some users of Sonoma, or MacOS 14 – the latest version of MacOS currently rolling out to Macs worldwide. It seems that upon...

Update your browser: Security updates address vulnerabilities including latest Chrome bugs

News, Security Update your browser: Security updates address vulnerabilities including latest Chrome bugs Share June 15th, 2023 Hi everyone! The Opera browser, Opera GX and Opera Crypto Browser have just received important updates addressing a number of vulnerabilities and bugs. Among those are t...

News feed preview can subscribe to feeds without interaction – Opera Security Advisories

News feed preview can subscribe to feeds without interaction – Opera Security Advisories OPCOM Team | August 12, 2010 Severity Low Description When Opera is previewing a news feed, certain types of content do not have their scripts removed correctly. These scripts are able to subscribe the user t...

File inputs can disclose the path to selected files

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 sensitive information which may be contained in the directory names. When manipulated by DOM this information should also not be exposed. Certain DO...

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

Double-clicking a link can unexpectedly run a program from the Internet – Opera Security Advisories OPCOM Team | June 29, 2010 Severity Moderately severe Description When a user clicks a link on a Web page that points to an executable file, Opera will show a download dialog to allow the user to...

Sites using revoked intermediate certificates might be shown as secure

Opera does not check the revocation status for intermediate certificates not served by the server. If the intermediate is revoked, this might not impact the security rating in Opera, and the site might be shown as secure...

Certain characters can be used to allow cross-site scripting

When accepting HTML content from untrusted users, Web sites sometimes employ some kind of filtering to ensure that the content cannot contain scripts. If the content is to be used inside an HTML attribute, characters that separate attributes need to be filtered out to prevent scripted attributes...

Startup crash can allow execution of arbitrary code – Opera Security Advisories

Startup crash can allow execution of arbitrary code – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Extremely Severe Problem Description When Opera is registered as a handler for a given protocol, it can be started by external applications. In some cases, being started in this...

Long hostnames in file: URLs can cause execution of arbitrary code – Opera Security Advisories

Long hostnames in file: URLs can cause execution of arbitrary code – Opera Security Advisories OPCOM Team | December 15, 2008 Severity Highly Severe Problem Description Exceptionally long host names in file: URLs can cause a buffer overflow, which may be exploited to execute arbitrary code. Remot...

HTML parsing flaw can cause Opera to execute arbitrary code – Opera Security Advisories

HTML parsing flaw can cause Opera to execute arbitrary code – Opera Security Advisories OPCOM Team | December 15, 2008 Severity Extremely Severe Problem Description Certain HTML constructs can cause the resulting DOM to change unexpectedly, which triggers a crash. To inject code, additional...

External news readers and e-mail clients can be used to execute arbitrary code

If a user has configured Opera to use an external newsgroup client or e-mail application, specially crafted Web pages can cause Opera to run that application incorrectly. In some cases this can lead to execution of arbitrary code...

Double-clicking a link can run a program from the Internet

Links in Web pages only require a single click. When a userdouble-clicks on a Web link, that action is taken as twoseparate clicks: One to follow the link, and the other toany dialog that might appear where the link was.A specially crafted page can place the link so that the"Open" button in the...

How does Opera make money? An explainer on monetization

Privacy How does Opera make money? An explainer on monetization Share June 22nd, 2026 Hi, Opera users! As many of you know, our products are free to download and use – so one of the most common questions we get from users is, “how does Opera make money?” It’s a fair question, and the answer is...

Why browsing with Opera’s VPN is safer

Security Why browsing with Opera’s VPN is safer Share July 10th, 2025 A virtual private network VPN is a great way to protect yourself online, especially on public hotspots. Opera is the first major browser to have a built-in, no-log, unlimited browser VPN that is completely free. So how can you...

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

News, Security Update your browser: Security fixes for latest Chrome zero-day Share March 27th, 2025 Hi everyone! The latest patches to the Opera and Opera GX address several recent vulnerabilities, including a zero-day exploit CVE-2025-2783. We recommend updating your browsers to the latest...

OpenSSL 3.0.7 security fix: Should Opera users be worried?

Security OpenSSL 3.0.7 security fix: Should Opera users be worried? Share November 3rd, 2022 Hi everyone! The OpenSSL 3.0.7 security-fix release fixes high-priority vulnerabilities in the OpenSSL open-source cryptography library, specifically CVE-2022-3602 and CVE-2022-3786. The vulnerabilities...

Bug bounty open for Opera Android apps!

News Bug bounty open for Opera Android apps! Share November 20th, 2018 We are happy to announce that our applications are now covered by the Google Play Security Reward Program. Researchers are invited to help us improve the security of our chosen products in return for fame and up to $5,000!...

Breach incident

News Breach incident Share December 11th, 2013 At Opera, we strive to be open, and we want to continue this tradition, by sharing with you what happens here. High profile companies like Opera are under continuous attack by hackers trying to break into their systems, and we want to tell you about ...

Security changes and features of Opera 18

News Security changes and features of Opera 18 Share December 4th, 2013 Opera 18 is now out on the stable channel, so we wanted to take a moment to go through some of the new features from a security perspective. Media Access One of the new features is media access. That is; camera and microphone...

CORS requests can omit the preflight request – Opera Security Advisories

Cross-Origin Resource Sharing CORS requests are required to send a preflight request if custom headers are included, to check that the host wishes to allow the full request to be made. An example of where this may be needed is for sites that use a custom header with a static value as part of thei...

The wrong executable may be used to display a downloaded file in its folder – Opera Security Advisories

The wrong executable may be used to display a downloaded file in its folder – Opera Security Advisories OPCOM Team | January 28, 2011 Severity Low Affected versions This issue affects Opera for Microsoft Windows. Description Opera’s downloads manager allows users to select a file, and open the...

Private video streams can be intercepted – Opera Security Advisories

Private video streams can be intercepted – Opera Security Advisories OPCOM Team | October 6, 2010 Severity Moderate Description Video content may be used as filler content for a HTML5 canvas, if the video format is natively supported by Opera. If the video and page are from the same site, the...

Malicious DLL files can be unintentionally loaded and allowed to run arbitrary code

Opera uses dynamic link libraries DLLs of its own, and several provided by the host operating system or plug-ins. In some cases, Opera searches for these DLLs in the same location as a resource that is being loaded, and if a malicious DLL is located, it will load that as if it were a trusted DLL...

Unexpected changes in tab focus can be used to run programs from the Internet – Opera Security Advisories

Unexpected changes in tab focus can be used to run programs from the Internet – Opera Security Advisories OPCOM Team | August 12, 2010 Severity Moderate Description Tabs may be used to obscure a download dialog that is visible in another tab. The dialog will allow the user to choose to run...

Heap buffer overflow in HTML5 canvas can be used to execute arbitrary code

Performing some painting operations on a canvas while certain transformations are being applied in Opera may result in heap buffer overflows. In most cases Opera will just freeze or terminate, but in some cases this could lead to a crash which could be used to execute code. To inject code,...

Opera security upgrade for Linux, Solaris and FreeBSD

A security issue in the Adobe Flash Player running in Opera on Linux, Solaris or FreeBSD has been found. Details about the vulnerability will be disclosed at a later date...

Resized canvas patterns can cause Opera to execute arbitrary code

HTML CANVAS elements can use scaled images as patterns. With suitable scaling manipulation of the image, a script can cause Opera to crash. This crash can sometimes cause memory corruption. To inject code, additional techniques will have to be employed...

Newsfeed prompt can cause Opera to execute arbitrary code

When Opera encounters a newsfeed source on a Web page, it prompts to add the source as a newsfeed. A script can manipulate the feed source in a way that can cause Opera to crash. The crash is caused by an erroneous memory access. To inject code, additional techniques will have to be employed...

Image properties can be used to execute scripts – Opera Security Advisories

Image properties can be used to execute scripts – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Highly Severe Problem Description Image properties can contain custom comments. When displaying the image properties, Opera can be tricked into treating the comments as script. This...

a specially crafted JavaScript can make Opera execute arbitrary code

A virtual function call on an invalid pointer that may referencedata crafted by the attacker can be used to execute arbitrary code...

A malicious torrent can cause Opera to execute arbitrary code – Opera Security Advisories

A malicious torrent can cause Opera to execute arbitrary code – Opera Security Advisories OPCOM Team | July 19, 2007 Summary A malicious torrent file can cause Opera to execute arbitrary code. Severity: High Problem description Removing a specially crafted torrent from the download managercan cra...

Malicious torrent files can execute arbitrary code in Opera – Opera Security Advisories

Malicious torrent files can execute arbitrary code in Opera – Opera Security Advisories OPCOM Team | May 24, 2007 Summary A malicious torrent file can cause Opera to execute arbitrary code. Severity: Highly critical Problem description A specially crafted torrent file can cause a buffer overflow ...

How Opera’s Security team helps make the web safer through responsible disclosure

Security How Opera’s Security team helps make the web safer through responsible disclosure Share April 17th, 2026 Hi everyone! At Opera, we have 30 years of experience in building safe and secure browsers. Our seasoned Security team collaborates internally as well as with external researchers to...

Prompt injection in Opera Neon: Rapid response through responsible disclosure

Security Prompt injection in Opera Neon: Rapid response through responsible disclosure Share October 23rd, 2025 Hi Opera users, This week, we were able to address a real-world security scenario on Opera Neon thanks to the work of a security researcher team. The researchers reached out to us throu...

New Opera 93 Stable update includes fix for latest Chromium zero-day

Security New Opera 93 Stable update includes fix for latest Chromium zero-day Share December 2nd, 2022 Hi everyone! Opera for Windows and Mac have received Stable updates 93.0.4585.37 and 93.0.4585.39 respectively. Among other things, these updates include Chromium update 107.0.5304.122, which...

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...

Certificate update

Security Certificate update Share December 9th, 2013 Last week we became aware of the existence of several unauthorized security certificates, issued in violation of rules for creation of such certificates. The certificates chained back to a French certificate authority, ANSSI, and had been signe...

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...

Cross-domain data theft with CSS load

CSS can be loaded cross-domain, and in some cases it is be possible to read the data pointed to, leading to the possibility of cross-domain data theft...

Cross-domain data theft with CSS load – Opera Security Advisories

Cross-domain data theft with CSS load – Opera Security Advisories OPCOM Team | January 11, 2010 Summary CSS can be loaded cross-domain, and in some cases it is be possible to read the data pointed to, leading to the possibility of cross-domain data theft. Severity Moderate Opera’s response Opera...

Certain domain names can allow execution of arbitrary code

Specially crafted domain names can cause a memory corruption in Opera, which may lead to a crash. Successful exploitation can lead to execution of arbitrary code...

TLS certificates can be used to execute arbitrary code

When connecting to a TLS-protected website, Opera parses the X.509 certificate. If a site uses a specially crafted Subject Alternative Name in the certificate, it can cause Opera to crash. To inject code, additional means will have to be employed...

Feed subscription can cause the wrong page address to be displayed

It has been reported that when a user subscribes to a news feed using the feed subscription button, the page address can be changed. This causes the address field not to update correctly. Although this can mean that that misleading information can be displayed in the address field, it can only...

Character Encoding Inheritance in iframes Can Enable Cross-Site Scripting

Pages displayed inside an iframe will inherit the character encodingof the parent page, unless they specify their own character encoding.A malicious page that uses the UTF-7 character encoding can includeother sites, for example inside iframes. This can be exploited toperform cross-site scripting...

Feed preview can reveal contents of unrelated news feeds

When Opera is previewing a news feed, some scripts are not correctly blocked. These scripts are able to subscribe the user to any feed URL that the attacker chooses, and can also view the contents of any feeds that the user is subscribed to. These may contain sensitive information...