An information disclosure exists in Brave Browser Desktop prior to version 1.28.62, where logged warning messages that included timestamps of connections to V2 onion domains in tor.log.

In Brave Desktop between versions 1.17 and 1.26.60, when adblocking is enabled and a proxy browser extension is installed, the CNAME adblocking feature issues DNS requests that used the system DNS settings instead of the extension's proxy settings, resulting in possible information disclosure.

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 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.