CVE-2025-10529CWE-942

CVE-2025-10529

Medium · published September 16, 2025

CVSS v3.1

6.5

EPSS

Percentile

21.7

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 6.5 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0: Not supplied
EPSS: 0.00302 · 21.7th percentile
Weakness: CWE-942 · Permissive Cross-domain Security Policy with Untrusted Domains
Published: 2025-09-16T17:15Z

Affected products (3)

Product	Versions	Fixed in
mozilla/firefox	< 140.3.0	140.3.0
mozilla/firefox	< 143.0	143.0
mozilla/thunderbird	< 143.0	143.0

References (7)

https://bugzilla.mozilla.org/show_bug.cgi?id=1970490 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-73/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-75/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-77/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-78/ · [email protected]https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html · af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html · af854a3a-2127-422b-91ae-364da2661108

EPSS history

Timeline

16 SEP 12:26Z
Same-origin policy bypass in the Layout component
cvelistv5