On most desktop platforms, Brave Browser versions 1.70.x-1.73.x included a feature to show a site's origin on the OS-provided file selector dialog when a site prompts the user to upload or download a file. However the origin was not correctly inferred in some cases. When combined with an open redirector vulnerability on a trusted site, this could allow a malicious site to initiate a download whose origin in the file select dialog appears as the trusted site which initiated the redirect.

In Brave Android prior to v1.67.116, domains in the Brave Shields popup are elided from the right instead of the left, which may lead to domain confusion.

Cross-Site Request Forgery (CSRF) vulnerability in Brave Brave Popup Builder.This issue affects Brave Popup Builder: from n/a through 0.7.0.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Brave Brave Popup Builder allows Stored XSS.This issue affects Brave Popup Builder: from n/a through 0.6.9.

Server-Side Request Forgery (SSRF) vulnerability in Brave Brave Popup Builder.This issue affects Brave Popup Builder: from n/a through 0.6.5.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Brave Brave – Create Popup, Optins, Lead Generation, Survey, Sticky Elements & Interactive Content allows Stored XSS.This issue affects Brave – Create Popup, Optins, Lead Generation, Survey, Sticky Elements & Interactive Content: from n/a through 0.6.2.

Brave Browser before 1.59.40 does not properly restrict the schema for WebUI factory and redirect. This is related to browser/brave_content_browser_client.cc and browser/ui/webui/brave_web_ui_controller_factory.cc.

An Open Redirect vulnerability exists prior to version 1.52.117, where the built-in QR scanner in Brave Browser Android navigated to scanned URLs automatically without showing the URL first. Now the user must manually navigate to the URL.

An omission of security-relevant information vulnerability exists in Brave desktop prior to version 1.48.171 when a user was saving a file there was no download safety check dialog presented to the user.

Prior to commit 51867e0d15a6d7f80d5b714fd0e9976b9c160bb0, https://github.com/brave/adblock-lists removed redirect interceptors on some websites like Facebook in which the redirect interceptor may have been there for security purposes. This could potentially cause open redirects on these websites. Brave's redirect interceptor removal feature is known as "debouncing" and is intended to remove unnecessary redirects that track users across the web.