CVE-2021-23986

2021-03-3113:41:04

mozilla

www.cve.org

6.8 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

50.9%

JSON

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.

CNA Affected

[
  {
    "product": "Firefox",
    "vendor": "Mozilla",
    "versions": [
      {
        "lessThan": "87",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  }
]