Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck
CVE-2026-121551PostfixAdmin through 4.0.5 Stored XSS via TOTP Exception Description
Medium 5.4
In plain English
A medium-severity cross-site scripting in postfixadmin from postfixadmin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:26.04:LTS | postfixadmin | no fix listed | UBUNTU-CVE-2026-121551 |
| Ubuntu:26.10 | postfixadmin | no fix listed | UBUNTU-CVE-2026-121551 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| postfixadmin | postfixadmin | 0 – through 4.0.5 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- GitHub Issue #1185 issue-tracking
- https://github.com/postfixadmin/postfixadmin product
- Fix commit patch
- https://github.com/postfixadmin/postfixadmin/blob/v4.0.5/public/users/totp-exceptions.php#L128 technical-description
- https://github.com/postfixadmin/postfixadmin/blob/v4.0.5/templates/totp-exceptions.tpl#L56 technical-description
- https://github.com/postfixadmin/postfixadmin/pull/1172 technical-description, patch, issue-tracking
- https://github.com/postfixadmin/postfixadmin/pull/1186 technical-description, patch, issue-tracking
- VulnCheck Advisory: PostfixAdmin through 4.0.5 Stored XSS via TOTP Exception Description third-party-advisory