CVE-2026-94613Network attack vectorHinoki check available

Service interruption via accepted SAML DOCTYPE declarations

Published Sep 24, 2026 · Updated Sep 24, 2026

Denial of service in authentik through 2026.2.6, 2026.5.0 through 2026.5.6, or 2026.8.0 through 2026.8.1 allows remote attackers to stop SAML workers. The shared lxml_from_string wrapper passed XML containing a DOCTYPE declaration directly to lxml instead of rejecting the declaration. Exploitation requires a SAML provider or source route; workers restart automatically and preserve sessions, but repeated messages keep some legitimate requests failing.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Oct 18, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in authentik through 2026.2.6, 2026.5.0 through 2026.5.6, or 2026.8.0 through 2026.8.1 allows remote attackers to stop SAML workers. The shared lxml_from_string wrapper passed XML containing a DOCTYPE declaration directly to lxml instead of rejecting the declaration. Exploitation requires a SAML provider or source route; workers restart automatically and preserve sessions, but repeated messages keep some legitimate requests failing.

The record

CVE
CVE-2026-94613
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
Authentik Security Inc.
Product
authentik
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.2.7
  2. Affected versionversion=>= 2026.5.0, < 2026.5.7
  3. Affected versionversion=>= 2026.8.0, < 2026.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Authentik Security Inc. · authentikversion=< 2026.2.7; version=>= 2026.5.0, < 2026.5.7; version=>= 2026.8.0, < 2026.8.2

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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