CVE-2021-23959

MEDIUM

Firefox < 85.0 - Cross-Site Scripting in Internal Error Pages

Title source: llm

Description

An XSS bug in internal error pages could have led to various spoofing attacks, including other error pages and the address bar. Note: This issue only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 85.

References (2)

Core 2

Core References

Release Notes, Vendor Advisory x_refsource_misc

https://www.mozilla.org/security/advisories/mfsa2021-03/

Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc

https://bugzilla.mozilla.org/show_bug.cgi?id=1659035

Scores

CVSS v3 6.1

EPSS 0.0030

EPSS Percentile 53.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE

CWE-79

Status published

Products (1)

mozilla/firefox < 85.0

Published Feb 26, 2021

Tracked Since Feb 18, 2026