🛡️ CVE-2025-9180 — firefox

🟠 CVSS 8.1 — High ✅ No Known Exploit CWE-346 NVD

8.1

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Same-origin policy bypass in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2025-9180 is classified as CWE-346: Origin Validation Error. The origin of a message or request is not verified properly, so one source can pose as another.

Affected software

CVE-2025-9180 is recorded against 2 packages.

firefox (from 140.0 up to 140.2.0)
thunderbird (from 140.0 up to 140.2.0)

Timeline and source

Published on 19 August 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

bugzilla.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
lists.debian.org
lists.debian.org

CVE-2025-9180 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity HIGH

CVSS Score 8.1

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

CWE CWE-346

Public Exploit ✅ No

Source NVD

Published 2025-08-19

Updated 2026-08-20

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
firefox	140.0	140.2.0
thunderbird	140.0	140.2.0

References

Issue Tracking, Permissions Required https://bugzilla.mozilla.org/show_bug.cgi?id=1979782

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-64/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-65/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-66/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-67/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-70/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-71/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-72/

https://lists.debian.org/debian-lts-announce/2025/08/msg00016.html

https://lists.debian.org/debian-lts-announce/2025/08/msg00018.html

🔗 NVD 🔗 Mitre

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