CVE-2025-5271

Previewing a response in Devtools ignored CSP headers, which could have allowed content injection attacks. This vulnerability was fixed in Firefox 139 and Thunderbird 139.

Score

CVSS 3.1 6.5 Medium

Status

Modified - security@mozilla.org

Published

2025-05-27

Last modified

2026-04-13

Weaknesses

CWE-116

Affected products

• Firefox (Mozilla)
• Thunderbird (Mozilla)

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1920348
• https://www.mozilla.org/security/advisories/mfsa2025-42/
• https://www.mozilla.org/security/advisories/mfsa2025-45/