Mozilla Firefox up to 119 HTTPS-only Mode clickjacking

Summaryinfo

A vulnerability marked as problematic has been reported in Mozilla Firefox up to 119. This affects an unknown part of the component HTTPS-only Mode. Performing a manipulation results in clickjacking. This vulnerability is reported as CVE-2023-6211. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Mozilla Firefox up to 119 (Web Browser). This affects an unknown code of the component HTTPS-only Mode. The manipulation with an unknown input leads to a clickjacking vulnerability. CWE is classifying the issue as CWE-451. The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks. This is going to have an impact on integrity. The summary by CVE is:

If an attacker needed a user to load an insecure http: page and knew that user had enabled HTTPS-only mode, the attacker could have tricked the user into clicking to grant an HTTPS-only exception if they could get the user to participate in a clicking game. This vulnerability affects Firefox < 120.

The weakness was disclosed 11/21/2023. It is possible to read the advisory at bugzilla.mozilla.org. This vulnerability is uniquely identified as CVE-2023-6211 since 11/20/2023. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/17/2025). The attack technique deployed by this issue is T1566.003 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 250132 (Linux Distros Unpatched Vulnerability : CVE-2023-6211), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 120 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (250132). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

Version

• 119

License

• open-source

Website

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

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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