Mozilla Firefox up to 126 Header X-Frame-Options access control

Summaryinfo

A vulnerability described as critical has been identified in Mozilla Firefox up to 126. This vulnerability affects unknown code of the component Header Handler. The manipulation of the argument X-Frame-Options results in access control. This vulnerability is known as CVE-2024-5691. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Mozilla Firefox up to 126. Affected is an unknown code block of the component Header Handler. The manipulation of the argument X-Frame-Options with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on integrity. CVE summarizes:

By tricking the browser with a `X-Frame-Options` header, a sandboxed iframe could have presented a button that, if clicked by a user, would bypass restrictions to open a new window. This vulnerability affects Firefox < 127 and Firefox ESR < 115.12.

The advisory is available at bugzilla.mozilla.org. This vulnerability is traded as CVE-2024-5691 since 06/06/2024. 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. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 06/18/2025). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 239895 (TencentOS Server 2: thunderbird (TSSA-2024:0254)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 127 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (239895). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

Version

• 126

License

• open-source

Website

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

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion