PostfixAdmin up to 4.0.5 TOTP Exception totp-exceptions.php description cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in PostfixAdmin up to 4.0.5. Affected is an unknown function of the file totp-exceptions.php of the component TOTP Exception. The manipulation of the argument Description leads to cross site scripting. This vulnerability is referenced as CVE-2026-121551. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in PostfixAdmin up to 4.0.5 and classified as problematic. This issue affects an unknown code of the file totp-exceptions.php of the component TOTP Exception. The manipulation of the argument description with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

PostfixAdmin through 4.0.5 contains a stored cross-site scripting vulnerability that allows authenticated mailbox users to inject script by creating a TOTP exception with an unescaped description. When a global administrator views totp-exceptions.php, the script runs in the admin session and can issue authenticated admin requests using the page's CSRF token.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-121551 since 11/03/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

By approaching the search of inurl:totp-exceptions.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• PostfixAdmin

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5

Website

• Product: https://github.com/postfixadmin/postfixadmin/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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