Vulnerability identifier: #VU102424

Vulnerability risk: Low

CVSSv3.1: 6.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-0237

CWE-ID: CWE-441

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox ESR
Client/Desktop applications / Web browsers

Vendor: Mozilla

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to WebChannel API does not check the sending principal but rather accepted the principal being sent when transporting data across processes. A local user can perform confused deputy attack and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 128.0 - 133.0.3

Firefox ESR: 128.0 - 128.5.2

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External links
http://bugzilla.mozilla.org/show_bug.cgi?id=1915257
http://www.mozilla.org/security/advisories/mfsa2025-01/
http://www.mozilla.org/security/advisories/mfsa2025-02/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.