CVE-2025-8031

CRITICAL 9.8

Incorrect URL stripping in CSP reports

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

The `username:password` part was not correctly stripped from URLs in CSP reports potentially leaking HTTP Basic Authentication credentials. This vulnerability was fixed in Firefox 141, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Jul 22, 2025
Last Updated	Apr 13, 2026

Stay Ahead of the Next One

Get instant alerts for mozilla firefox

Be the first to know when new critical vulnerabilities affecting mozilla firefox are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

Mozilla / Firefox

All versions affected

Mozilla / Thunderbird

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1971719 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-56/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-58/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-59/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-61/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-62/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-63/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html

Credits

Tom Schuster