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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.
Base Score: 4.3
Impact Score: 2.9
Exploitability Score: 8.6
Base Score: 6.5
Impact Score: 3.6
Exploitability Score: 2.8
|149233||GLSA-202104-10 : Mozilla Firefox: Multiple vulnerabilities||Nessus||Gentoo Local Security Checks|
|148135||Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : Firefox vulnerabilities (USN-4893-1)||Nessus||Ubuntu Local Security Checks|
|148015||Mozilla Firefox < 87.0||Nessus||MacOS X Local Security Checks|
|148014||Mozilla Firefox < 87.0||Nessus||Windows|