Mozilla Firefox prior 153.1/154 Graphics privileges management

Summaryinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox. The impacted element is an unknown function of the component Graphics. The manipulation results in privileges management. This vulnerability is identified as CVE-2026-74947. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Mozilla Firefox. It has been classified as critical. Affected is some unknown functionality of the component Graphics. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

The advisory is shared for download at bugzilla.mozilla.org. This vulnerability is traded as CVE-2026-74947 since 08/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/23/2026). The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 338150 (Linux Distros Unpatched Vulnerability : CVE-2026-74947), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 153.1 or 154 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (338150). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

License

• open-source

Website

• Vendor: https://www.mozilla.org/
• Product: https://www.mozilla.org/en-US/firefox/

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Once again VulDB remains the best source for vulnerability data.

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