CVE-2025-10529

MEDIUM

Published Sep 16, 2025 Modified Apr 13, 2026 CWE-942

Description

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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-942 CWE-942

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 140.3.0
mozilla	firefox	< 143.0
mozilla	thunderbird	< 143.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-73/ https://www.mozilla.org/security/advisories/mfsa2025-75/ https://www.mozilla.org/security/advisories/mfsa2025-77/ https://www.mozilla.org/security/advisories/mfsa2025-78/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1970490 https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html https://lists.debian.org/debian-lts-announce/2025/09/msg00026.html

Frequently Asked Questions

What is CVE-2025-10529? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-10529? +

CVE-2025-10529 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-10529? +

CVE-2025-10529 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-10529? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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