All vulnerabilities
CVE-2026-94613GHSA-cxwx-9x59-28qm

authentik: Denial of Service via Document Type Declarations in SAML Messages

goauthentik authentik
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.64%Chance of exploitation activity in the next 30 days, higher than 50% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published24 Sep 2026Updated 29 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

authentik is an open-source identity provider. Prior to 2026.2.7, 2026.5.7, and 2026.8.2, an unauthenticated attacker can submit a malformed SAML message to an authentik deployment using SAML in either the identity-provider or SAML source role. The message can stop the worker handling /application/saml/* or /source/saml/*, causing the requests assigned to that worker to fail. Worker process termination and automatic restart do not destroy database-backed sessions, but continued malicious messages can cause a sustained share of legitimate traffic to fail. Other protocol implementations are not affected. This issue is fixed in versions 2026.2.7, 2026.5.7, and 2026.8.2.

Text from CVE List

Affected versions 3

  • authentikaffected: < 2026.2.7CVE List
  • authentikaffected: >= 2026.5.0, < 2026.5.7CVE List
  • authentikaffected: >= 2026.8.0, < 2026.8.2CVE List

References 15