HighCVE-2026-94613

    authentik: Denial of Service via Document Type Declarations in SAML Messages (CVE-2026-94613)

    Published Last modified Sources: OSV, CVE.org

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    What is affected, what to do

    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.

    Update Goauthentik Authentik to version 2026.2.7.

    Affected
    • Goauthentik Authentik gte 2026.5.0, < 2026.5.7..*
    • Goauthentik Authentik lt *..2026.2.7
    Fixed in
    • Goauthentik Authentik 2026.2.7

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    7.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: OSV, CVE.org

    0.6 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 51.0

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    85.62 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.6 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    51.0
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 29 September 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-770

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    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.

    Source: OSV (Open Source Vulnerabilities), NVD (NIST), cvelistv5

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    goauthentikauthentik
    • < 2026.2.7
    • ≥ 2026.5.0, < 2026.5.7
    • 2026.2.7
    • —
    Distribution and container packages (2)

    Downstream packages (e.g. Bitnami, Debian, Ubuntu, Red Hat). Versions refer to the distribution, not the vendor.

    Distribution and container packages
    Affected versionsFixed in
    bitnamiauthentik
    • 2026.5.0
    • 2026.8.0
    • —
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-770Allocation of Resources Without Limits or Throttling

      Base

      The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

      Entry at MITRE CWE-770

    References & sources

    • github.comgoauthentik/authentik/security/advisories/GHSA-cxwx-9x59-28qmx_refsource_CONFIRM
    • github.comgoauthentik/authentik/pull/25959x_refsource_MISC
    • github.comgoauthentik/authentik/pull/25964x_refsource_MISC
    • github.comgoauthentik/authentik/pull/25969x_refsource_MISC
    • github.comgoauthentik/authentik/pull/25974x_refsource_MISC
    • github.comgoauthentik/authentik/commit/03d19d63b8d8dd7bc3de7cf6e57c6df341…x_refsource_MISC
    • github.comgoauthentik/authentik/commit/4cf2f803b1c2ef38c224eead375fd057a1…x_refsource_MISC
    • github.comgoauthentik/authentik/commit/732adad26bb97361b6bf25ef138df5c164…x_refsource_MISC
    • github.comgoauthentik/authentik/commit/a029f5372295bfeb1e334855f78601681c…x_refsource_MISC
    • docs.goauthentik.ioreleases/2026.2x_refsource_MISC
    • docs.goauthentik.ioreleases/2026.5x_refsource_MISC
    • docs.goauthentik.ioreleases/2026.8x_refsource_MISC
    • github.comgoauthentik/authentik/releases/tag/version/2026.2.7x_refsource_MISC
    • github.comgoauthentik/authentik/releases/tag/version/2026.5.7x_refsource_MISC
    • github.comgoauthentik/authentik/releases/tag/version/2026.8.2x_refsource_MISC
    • NVD (NIST)vuln/detail/CVE-2026-94613web

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: yes

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-94613","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-09-29T02:53:11.993694Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. ReceivedGitHub

      CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

      Weakness type: CWE-770

      Description added or changed

      Show 19 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      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.
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-770
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/94xxx/CVE-2026-94613.json">CVE-2026-94613</a>
      Referenceadded
      —
      https://docs.goauthentik.io/releases/2026.2#fixed-in-202627
      Referenceadded
      —
      https://docs.goauthentik.io/releases/2026.5#fixed-in-202657
      Referenceadded
      —
      https://docs.goauthentik.io/releases/2026.8#fixed-in-202682
      Referenceadded
      —
      https://github.com/goauthentik/authentik/commit/03d19d63b8d8dd7bc3de7cf6e57c6df341a9fc86
      Referenceadded
      —
      https://github.com/goauthentik/authentik/commit/4cf2f803b1c2ef38c224eead375fd057a10ee8ac
      Referenceadded
      —
      https://github.com/goauthentik/authentik/commit/732adad26bb97361b6bf25ef138df5c16471ba1f
      Referenceadded
      —
      https://github.com/goauthentik/authentik/commit/a029f5372295bfeb1e334855f78601681cdc9a2d
      Referenceadded
      —
      https://github.com/goauthentik/authentik/pull/25959
      Referenceadded
      —
      https://github.com/goauthentik/authentik/pull/25964
      Referenceadded
      —
      https://github.com/goauthentik/authentik/pull/25969
      Referenceadded
      —
      https://github.com/goauthentik/authentik/pull/25974
      Referenceadded
      —
      https://github.com/goauthentik/authentik/releases/tag/version/2026.2.7
      Referenceadded
      —
      https://github.com/goauthentik/authentik/releases/tag/version/2026.5.7
      Referenceadded
      —
      https://github.com/goauthentik/authentik/releases/tag/version/2026.8.2
      Referenceadded
      —
      https://github.com/goauthentik/authentik/security/advisories/GHSA-cxwx-9x59-28qm

      Source identifier: security-advisories@github.com

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