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CVE-2021-23986

Published: 2021-03-31T14:15Z
Last Modified: 2024-11-21T05:52Z
Source: MITRE CVE List
License: MITRE-CVE-TOS
A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87. > MITRE Terms of Use apply – see LICENSE‑MITRE.txt