Script injection in feed preview can reveal contents of unrelated news feeds – Opera Security Advisories

Script injection in feed preview can reveal contents of unrelated news feeds – Opera Security Advisories OPCOM Team | December 15, 2008 Severity Highly Severe Problem Description When Opera is previewing a news feed, some scripted URLs are not correctly blocked. These can execute scripts which ar...

Pages held in frames are able to change the location of pages in unrelated frames on the parent page – Opera Security Advisories

Pages held in frames are able to change the location of pages in unrelated frames on the parent page – Opera Security Advisories OPCOM Team | June 11, 2008 Severity: Less Severe Problem Description: Pages from different sources held on the same parent page should not be able to modify the locatio...

Certain characters can obscure the page address – Opera Security Advisories

Certain characters can obscure the page address – Opera Security Advisories OPCOM Team | June 9, 2008 Severity: Less Severe Problem Description When a page address contains certain characters, they can cause the page address text to be misplaced. In some cases, this could make characters be...

Vulnerability in Opera’s use of kfmclient – Opera Security Advisories

Vulnerability in Opera’s use of kfmclient – Opera Security Advisories OPCOM Team | February 9, 2007 Severity: Moderate Since version 7.50, Opera for Linux has offered theuser a new way to open files which Opera can not openitself: “Open with kfmclient”. This feature can beexploited to run malicio...

Opera not vulnerable to JPEG processing vulnerability in Microsoft’s GDI+ library – Opera Security Advisories

Opera not vulnerable to JPEG processing vulnerability in Microsoft’s GDI+ library – Opera Security Advisories OPCOM Team | February 9, 2007 Opera is not vulnerable to the JPEG processing vulnerability in Microsoft’s GDI+ library. Details: Microsoft Security Bulletin MS04-028 Buffer Overrun in JPE...

Opera for Android has received Google Play’s Independent Security Review badge. Here’s what this means for your security

Security Opera for Android has received Google Play’s Independent Security Review badge. Here’s what this means for your security Share January 30th, 2025 Hey Opera users! You might have seen that Opera for Android has achieved a new security-focused milestone: If you search for Opera for Android...

Opera’s response to misleading headlines regarding the “MyFlaw” security vulnerability

Security Opera’s response to misleading headlines regarding the “MyFlaw” security vulnerability Share January 17th, 2024 We have noticed some misleading media articles regarding the so-called “MyFlaw” vulnerability that allegedly puts Opera users at risk. This is NOT true. The coverage presents...

Are you still using public Wi-Fi without a VPN?

Security Are you still using public Wi-Fi without a VPN? Share October 14th, 2022 Hi readers, October is Cybersecurity Awareness Month and the focus is on you, the user. All the privacy and security features in the world are worth nothing if we ourselves don’t apply some best practices to our...

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...

What is the TLS padlock saying?

Security What is the TLS padlock saying? Share November 20th, 2020 Alice and Bob use TLS to keep their long distance relationship hot and private. TL;DR: skip to the conclusions to see what Alice learned. The Privacy Problem Alice and Bob had to turn their relationship into a long distance one...

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...

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 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...

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...

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...

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...

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...

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...

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...

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...

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...

Opera 12 and Opera Mail security update

Security Opera 12 and Opera Mail security update Share February 16th, 2016 We realize that those of you on old operating systems like Windows XP SP1 and older are left without much choice beyond using our Presto-based browser. With security standards on the web changing so much we didn’t want to...

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...

New home for the Security Group blog

News New home for the Security Group blog Share October 31st, 2013 Welcome to the new home of the Opera Security Group. We have changed our blogging platform. For more more information regarding the switch, please see this post. If you received this blog post in your feed reader, you do not need ...

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...

Heap buffer overflow in string to number conversion – Opera Security Advisories

Passing very long strings through the string to number conversion using JavaScript in Opera may result in heap buffer overflows. This also affects the dtoa routine, and was reported in CVE-2009-0689. In most cases Opera will just freeze or terminate, but in some cases this could lead to a crash...

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...

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...

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...