CVE-2026-121551

medium

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.

References

https://www.vulncheck.com/advisories/postfixadmin-through-4.0.5-stored-xss-via-totp-exception-description

https://github.com/postfixadmin/postfixadmin/pull/1186

https://github.com/postfixadmin/postfixadmin/pull/1172

https://github.com/postfixadmin/postfixadmin/issues/1185

https://github.com/postfixadmin/postfixadmin/commit/0a894b08769481ce1a7f0f42af901c6d9f88fa9c

https://github.com/postfixadmin/postfixadmin/blob/v4.0.5/templates/totp-exceptions.tpl#L56

https://github.com/postfixadmin/postfixadmin/blob/v4.0.5/public/users/totp-exceptions.php#L128

https://github.com/postfixadmin/postfixadmin

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-115896

Details

Source: Mitre, NVD

Published: 2026-11-03

Updated: 2026-11-03

Risk Information

CVSS v2

Base Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.4

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Severity: Medium

CVSS v4

Base Score: 5.1

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Severity: Medium

EPSS

EPSS: 0.00283