CVE-2025-10534

HIGH

Published Sep 16, 2025 Modified Apr 13, 2026 CWE-79

Description

Spoofing issue in the Site Permissions component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

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CVSS v3.1 Score

8.1

HIGH

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
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/mfsa2025-77/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1665334

Frequently Asked Questions

What is CVE-2025-10534? +

Spoofing issue in the Site Permissions component. This vulnerability was fixed in Firefox 143 and Thunderbird 143. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2025-10534? +

CVE-2025-10534 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-10534? +

CVE-2025-10534 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-2025-10534? +

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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