CVE-2011-2990: Mozilla Firefox

Medium severity, CVSS 5.0. EPSS: 1% chance of exploitation in the next 30 days.

The implementation of Content Security Policy (CSP) violation reports in Mozilla Firefox 4.x through 5, SeaMonkey 2.x before 2.3, and possibly other products does not remove proxy-authorization credentials from the listed request headers, which allows attackers to obtain sensitive information by reading a report, related to incorrect host resolution that occurs with certain redirects.

Affected products

• Mozilla Firefox: version 4.0 only; version 4.0.1 only; version 5.0 only
• Mozilla Seamonkey: version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; version 1.0.5 only; …

Published 2011-08-18. Last modified 2026-06-16.