Update your browser: Security fixes for latest Chrome bugs

News, Security Update your browser: Security fixes for latest Chrome bugs Share August 10th, 2023 Hi everyone! Opera, Opera GX, and Opera Crypto Browser have received important updates addressing a number of vulnerabilities and bugs. Among those are the following important vulnerabilities detecte...

Opera’s Security team at Barcelona Cybersecurity Congress 2023

Security Opera’s Security team at Barcelona Cybersecurity Congress 2023 Share February 9th, 2023 Hello readers! If you follow our Security team’s Twitter account it’s here, by the way!, you’ll have noticed we were busy last week meeting cybersecurity enthusiasts and professionals at this year’s...

Opera becomes part of the CNA program

News Opera becomes part of the CNA program Share December 13th, 2019 Usually, Friday the 13th is considered to be an unlucky day. However, this is not the case for Opera, as we have great news, especially for security researchers and all security-minded Opera fans. We are proud to announce that...

Opera asks for my keychain password on macOS – what do I do? Opera 53 has a new signing certificate

Security Opera asks for my keychain password on macOS – what do I do? Opera 53 has a new signing certificate Share May 30th, 2018 Hello, We would like to let you know that we have updated our software signing certificate from Opera Software ASA to Opera Software AS. This is why your macOS is aski...

Upcoming update with IDN homograph phishing fix

Security Upcoming update with IDN homograph phishing fix Share April 21st, 2017 Domains are an integral part of the internet. Similar to how people write different languages using different characters or scripts, domain names can be composed of various scripts in whole or in part, and are called...

DLL hijacking and the Opera browser

Security DLL hijacking and the Opera browser Share March 10th, 2017 Recently, a collection of documents was released online, which was claimed to have originated with a major World power. The documents listed hacking vectors that could be used to inject code into major operating systems and...

Legacy Opera Presto source code appearance in online sharing sites

Security Legacy Opera Presto source code appearance in online sharing sites Share January 18th, 2017 Opera recently became aware that source code from our legacy browser engine, Presto, has appeared in some online code and file sharing sites. This code is the property of Opera Software and has be...

Thanks to the researchers 2016

Research Thanks to the researchers 2016 Share April 19th, 2016 A number of researchers and website testers have offered their assistance throughout the year to help us tighten the security of our many websites. Thanks to all! Special mention goes to those who discover and report security issues:...

Optimizing encrypted video

Security Optimizing encrypted video Share February 25th, 2015 You might have seen our press release that Opera’s Rocket Optimizer can now optimize encrypted video streams. The attentive reader will already have halted and said, “wait, what?”. In this blog post, we’ll explain how this works. Rocke...

Security changes in Opera 25; the poodle attacks

Security Security changes in Opera 25; the poodle attacks Share October 15th, 2014 So the last weeks have been rather hectic behind the scenes in the browser security world, when Google security group found a new way to exploit a rather well known design weakness in SSLv3 published in the paper...

Security changes in Opera 20 update

Security Security changes in Opera 20 update Share March 13th, 2014 We have just released a silent update of Opera 20, you would most likely not even have noticed. From a security perspective, we have made two interesting changes in this update. The first one regards what we call the badge, the...

Carefully timed redirects can allow cross site scripting – Opera Security Advisories

Scripts on a page are supposed to be restricted so that they can only interact with other pages from the same domain and security context. Carefully timed redirects can cause scripts to execute in the wrong security context in Opera. This allows cross site scripting XSS...

Element HTML content can be incorrectly returned without escaping, bypassing some HTML sanitizers – Opera Security Advisories

When sites accept HTML from untrusted users, and use that HTML as page content, they typically sanitize the untrusted HTML to ensure that it does not contain any harmful content, such as malicious scripts. In some cases, this sanitization may be performed by writing and reading the contents of DO...

Small windows can be used in several ways to trick users into executing downloads – Opera Security Advisories

When the download dialog is displayed, it should always be visible to the user, to ensure that the user realizes it is there. If the dialog is displayed in a small enough window, the user may not realize it is being displayed, and if the right keyboard sequence is carefully followed, they can end...

Printing issue can allow data leaks to other system users, or allow them to corrupt data – Opera Security Advisories

When pages are printed by Opera, a temporary file is created, which contains the document to print. This document is not created with the correct permissions, allowing other users of the system to read its contents. When printed with certain popular printing frameworks, an additional temporary fi...

Issue with error pages can cause a system crash – Opera Security Advisories

When attempting to resolve a URL which cannot be interpreted as a legal URL, Opera will create an error page to display to the user when they load it. If enough invalid URLs can be created, Opera can use up all available disk space with these error pages, causing the browser or operating system t...

Large form inputs can allow execution of arbitrary code – Opera Security Advisories

Large form inputs can allow execution of arbitrary code – Opera Security Advisories OPCOM Team | January 25, 2011 Severity Critical Description When certain large form inputs appear on a web page, they can cause Opera to crash. In some cases, the crash can lead to memory corruption, which could b...

Web page content can display misleading security information – Opera Security Advisories

Dialogs such as the security information dialog and download dialog are displayed over the top of the webpage content. In some cases, webpage content will be incorrectly displayed on top of the dialogs, or over parts of the dialogs. This content can then display misleading security information,...

JavaScript might run in the wrong context if loaded from error page – Opera Security Advisories

JavaScript might run in the wrong context if loaded from error page – Opera Security Advisories OPCOM Team | October 11, 2010 Severity Moderate Description If Opera is sent to an invalid URL, an error page will be displayed along with a link to the URL. The URL linked to might run scripts, and in...

Manipulating the window can be used to spoof the page address – Opera Security Advisories

Manipulating the window can be used to spoof the page address – Opera Security Advisories OPCOM Team | October 6, 2010 Severity Low Description Web page scripts can be used to alter the size of the browser window. In some cases, this manipulation can cause the wrong part of the Web page address t...

Specially crafted JPEG images can be used to execute arbitrary code – Opera Security Advisories

Specially crafted JPEG images can be used to execute arbitrary code – Opera Security Advisories OPCOM Team | February 25, 2009 Severity Extremely Severe Problem Description Specially crafted JPEG images can cause Opera to corrupt memory and crash. Successful exploitation can lead to execution of...

Feed preview can reveal contents of unrelated news feeds – Opera Security Advisories

Feed preview can reveal contents of unrelated news feeds – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Highly Severe Platforms All desktop versions Problem Description When Opera is previewing a news feed, some scripts are not correctly blocked. These scripts are able to...

Custom shortcuts can pass the wrong parameters to applications – Opera Security Advisories

Custom shortcuts can pass the wrong parameters to applications – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Moderately Severe Problem Description Custom shortcut and menu commands can be used to activate external applications. In some cases, the parameters passed to these...

A JPEG image with a malformed header can crash Opera – Opera Security Advisories

A JPEG image with a malformed header can crash Opera – Opera Security Advisories OPCOM Team | December 16, 2008 Summary A JPEG image with a malformed header can crash Opera, and causearbitrary code to be run. Severity Moderate Problem description A specially crafted DHT marker in the JPEG file...

Update your browser regularly

Security Update your browser regularly Share February 12th, 2021 Mallory tries to hack an OS in order to spy on Alice. TL;DR: skip to the conclusions to see what Alice learned. Update your browser regularly Every once in a while you’re asked to update the software on your computer, or just told...

How private is a private window?

Privacy How private is a private window? Share October 15th, 2020 Alice and Bob find themselves in a shared living-space, where long-held secrets are at risk of being revealed. TL;DR: skip to the conclusions to see what Alice learned. The Privacy Problem Alice and Bob recently decided to take the...

Bypass a restriction in OfA 54 – Opera Security Advisories

Opera for Android before 54.0.2669.49432 is vulnerable to a sandboxed cross-origin iframe bypass attack. By using a service working inside a sandboxed iframe it is possible to bypass the normal sandboxing attributes. This allows an attacker to make forced redirections without any user interaction...

Thanks to the researchers 2017

Research Thanks to the researchers 2017 Share March 3rd, 2017 We would like to thank the researchers who have offered us their assistance throughout the year, to help enhance the security of our websites. Special mention goes to those who discover and report security issues: Johnny Nipper Mehmet...

Opera installer mistakenly marked as malicious

Security Opera installer mistakenly marked as malicious Share February 22nd, 2017 During the past few days some of our users have contacted us raising the concern that the Qihoo 360 Total Security anti-virus software has been labelling the Opera installer executable for Windows as some form of...

Thanks to the researchers 2014

Research Thanks to the researchers 2014 Share January 31st, 2014 Each year, a number of researchers offer their assistance to help us tighten the security of our wide array of websites. We would like to take this opportunity to thank the researchers and testers of 2014 for their assistance in...

Pages can prevent navigation to a target page, spoofing the address field – Opera Security Advisories

When a user types a new URL for the browser to load, the currently active page may detect when the new page is about to load and prevent the navigation, while still leaving the new URL displayed in the address bar. This can then be used to spoof the URL of the target page. The malicious page woul...

Certain characters can be used to allow cross-site scripting – Opera Security Advisories

Certain characters can be used to allow cross-site scripting – Opera Security Advisories OPCOM Team | December 17, 2008 Severity Highly Severe Problem Description When accepting HTML content from untrusted users, Web sites sometimes employ some kind of filtering to ensure that the content cannot...

The links panel can allow cross-site scripting – Opera Security Advisories

The links panel can allow cross-site scripting – Opera Security Advisories OPCOM Team | December 16, 2008 Severity Highly Severe Problem Description 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...

Simulated text inputs can trick users into uploading arbitrary files – Opera Security Advisories

Simulated text inputs can trick users into uploading arbitrary files – Opera Security Advisories OPCOM Team | December 16, 2008 Severity: Moderately Severe Problem Description When a user types into a file input, scripts can cause some of the keystrokes to be ignored. If the script can convince t...

Fuzzing HTTP Proxies: Squid, Part 2

Research Fuzzing HTTP Proxies: Squid, Part 2 Share October 1st, 2021 Security is important to us, here at Opera. That’s why, apart from making our browsers safer, we also want to make the Web a bit safer. One of those ways is helping other developers find and fix vulnerabilities in their products...

Making browsing safe from phishing

Privacy, Security Making browsing safe from phishing Share January 7th, 2021 Mallory tries to create a phishing site to lure Alice into revealing her secrets. TL;DR: skip to the conclusions to see what Alice learned. The Privacy Problem In the previous episode, Mallory was thinking about...

Security changes in Opera 23

News Security changes in Opera 23 Share August 19th, 2014 Opera 23 has been out on the stable channel for a while, and we have just released a few silent security updates as well. The first was a regular Opera security fix, the second was to take in a security patch in advance of the regular...

Security changes and features of Opera 19

Security Security changes and features of Opera 19 Share January 31st, 2014 Opera 19 is now been put through its paces on the Developer and Next channels, and is now out on the Stable channel. Opera 19 for Android has also recently been released. New features As with every release, each new featu...

WAP form content can be leaked to other sites – Opera Security Advisories

When accepting user input in form fields on a WAP page, WML requires that the input contents are remembered, and used to populate every further input sharing the same name. This should continue as long as the user continues to click links known as a WAP session, even populating similarly named...

Thanks to the researchers 2018

News Thanks to the researchers 2018 Share February 13th, 2018 Every year, researchers offer us their assistance to help enhance the security of our websites. We would like to thank those who discovered and reported security issues in 2018. EDIT: The list of researchers was moved to our new site,t...

Thanks to the researchers 2015

Research Thanks to the researchers 2015 Share January 16th, 2015 At Opera Software, we run a large number of websites for our products and services, and we like to give credit to the researchers and website testers who offer their assistance to help us tighten the security of those websites. We...