Security Experts:

Connect with us

Hi, what are you looking for?

SecurityWeekSecurityWeek

Application Security

Twitter Tells Users Firefox Possibly Exposed Personal Information

Twitter informed users on Thursday that their personal information may have been exposed due to the way the Firefox web browser stores cached data.

Twitter informed users on Thursday that their personal information may have been exposed due to the way the Firefox web browser stores cached data.

The social media giant discovered recently that Firefox’s cache stored some private information associated with the use of Twitter, including sent or received direct messages and the downloaded data archive. However, this would only be problematic on shared computers.

“We recently learned that the way Mozilla Firefox stores cached data may have resulted in non-public information being inadvertently stored in the browser’s cache,” Twitter explained. “This means that if you accessed Twitter from a shared or public computer via Mozilla Firefox and took actions like downloading your Twitter data archive or sending or receiving media via Direct Message, this information may have been stored in the browser’s cache even after you logged out of Twitter.”

The company added in a message posted on Twitter, “There isn’t a standard for how browsers cache downloaded data. We noticed that the way Firefox stores cached Twitter data is different (but not wrong) than other browsers and could put your non-public info at risk.”

Firefox only stores cached data for 7 days, which means the Twitter data would have only been exposed for a limited period of time. Users can also manually clear the cache, which Twitter recommends for users who accessed Twitter from a shared or public device.

Twitter has made some changes on its end to ensure Firefox no longer stores potentially sensitive information belonging to its users. Safari and Chrome do not appear to be impacted.

Twitter has disclosed several security and privacy issues over the past few years, including related to the use of account security information for advertising, the Android app exposing protected tweets, an API vulnerability exploited to match usernames to phone numbers, the Android app allowing hackers to obtain sensitive data and hijack accounts, and direct messages being exposed to third-party developers.

Related: Twitter Moves to Curb Manipulated Content Including ‘Deepfakes’

Related: Twitter Promises Increased Transparency With New Privacy Center

Related: Twitter, Facebook User Data Improperly Accessed via Malicious SDKs

Related: Twitter Users Can Now Use 2FA Without a Phone Number

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Expert Insights

Related Content

Application Security

Cycode, a startup that provides solutions for protecting software source code, emerged from stealth mode on Tuesday with $4.6 million in seed funding.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

IoT Security

Lexmark warns of a remote code execution (RCE) vulnerability impacting over 120 printer models, for which PoC code has been published.

Mobile & Wireless

Apple rolled out iOS 16.3 and macOS Ventura 13.2 to cover serious security vulnerabilities.

Email Security

Microsoft is urging customers to install the latest Exchange Server updates and harden their environments to prevent malicious attacks.

Mobile & Wireless

Technical details published for an Arm Mali GPU flaw leading to arbitrary kernel code execution and root on Pixel 6.

Vulnerabilities

Security researchers have observed an uptick in attacks targeting CVE-2021-35394, an RCE vulnerability in Realtek Jungle SDK.

Vulnerabilities

Google has awarded more than $25,000 to the researchers who reported the vulnerabilities patched with the release of the latest Chrome update.