CVE-2025-10529

MEDIUM 6.5

Same-origin policy bypass in the Layout component

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

Same-origin policy bypass in the Layout component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Sep 16, 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 medium 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=1970490 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-73/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-75/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-77/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-78/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html

Credits

Daniel Holbert