CVE-2021-23986

Summary

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.

Affected Software

VendorProductVersion RangeStatus
MozillaFirefoxunspecified < 87affected

Weaknesses

  • A malicious extension could have performed credential-less same origin policy violations

ADP Enrichment

CVE Program Container

Additional References

References