CVE-2026-121551: postfixadmin postfixadmin

Affected products, as the CNA wrote them
Vendor	Product	Versions
postfixadmin	postfixadmin pkg:composer/postfixadmin/postfixadmin	affected 4.0.5 and earlier semver Other versions: unaffected

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.1	Medium	4.0	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	CNA (VulnCheck)Used for this record
5.4	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0028, the 20th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

3 Nov 2026, 15:17 UTC Confirmed by the CVE List
3 Nov 2026, 15:23 UTC First seen by agentprime
3 Nov 2026, 16:17 UTC Confirmed by NVD

Sources

References from the CNA

github.com/postfixadmin/postfixadmin/issues/1185 issue-tracking
github.com/postfixadmin/postfixadmin product
github.com/postfixadmin/postfixadmin/commit/0a894b08769481ce1a7f0f42af901c6d9f88fa9c patch
github.com/postfixadmin/postfixadmin/blob/v4.0.5/public/users/totp-exceptions.php#L128 technical-description
github.com/postfixadmin/postfixadmin/blob/v4.0.5/templates/totp-exceptions.tpl#L56 technical-description
github.com/postfixadmin/postfixadmin/pull/1172 technical-descriptionpatchissue-tracking
github.com/postfixadmin/postfixadmin/pull/1186 technical-descriptionpatchissue-tracking
www.vulncheck.com/advisories/postfixadmin-through-4.0.5-stored-xss-via-totp-exception-description third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.