Brave is an open source web browser with a focus on privacy and security. In Brave versions 1.17.73-1.20.103, the CNAME adblocking feature added in Brave 1.17.73 accidentally initiated DNS requests that bypassed the Brave Tor proxy. Users with adblocking enabled would leak DNS requests from Tor windows to their DNS provider. (DNS requests that were not initiated by CNAME adblocking would go through Tor as expected.) This is fixed in Brave version 1.20.108

The implementation of Brave Desktop's privacy-preserving analytics system (P3A) between 1.1 and 1.18.35 logged the timestamp of when the user last opened an incognito window, including Tor windows. The intended behavior was to log the timestamp for incognito windows excluding Tor windows. Note that if a user has P3A enabled, the timestamp is not sent to Brave's server, but rather a value from:Used in last 24hUsed in last week but not 24hUsed in last 28 days but not weekEver used but not in last 28 daysNever usedThe privacy risk is low because a local attacker with disk access cannot tell if the timestamp corresponds to a Tor window or a non-Tor incognito window.

Brave Software Inc. Brave version version 0.22.810 to 0.24.0 contains a Other/Unknown vulnerability in function ContentSettingsObserver::AllowScript() in content_settings_observer.cc that can result in Websites can run inline JavaScript even if script is blocked, making attackers easier to track users. This attack appear to be exploitable via the victim must visit a specially crafted website. This vulnerability appears to have been fixed in 0.25.2.

A hang issue was discovered in Brave before 0.14.0 (on, for example, Linux). The vulnerability is caused by mishandling of JavaScript code that triggers the reload of a page continuously with an interval of 1 second.

A hang issue was discovered in Brave before 0.14.0 (on, for example, Linux). This vulnerability is caused by the mishandling of a long URL formed by window.location+='?\u202a\uFEFF\u202b'; concatenation in a SCRIPT element.

Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource consumption) via a long alert() argument in JavaScript code, because window dialogs are mishandled.

Brave Browser before 0.13.0 allows a tab to close itself even if the tab was not opened by a script, resulting in denial of service.

Brave Software's Brave Browser, version 0.19.73 (and earlier) is vulnerable to an incorrect access control issue in the "JS fingerprinting blocking" component, resulting in a malicious website being able to access the fingerprinting-associated browser functionality (that the browser intends to block).

Brave 0.12.4 has a URI Obfuscation issue in which a string such as https://safe.example.com@unsafe.example.com/ is displayed without a clear UI indication that it is not a resource on the safe.example.com web site.

Brave 0.12.4 has a Status Bar Obfuscation issue in which a redirection target is shown in a possibly unexpected way. NOTE: third parties dispute this issue because it is a behavior that might have legitimate applications in (for example) the display of web-search results