Vulnerability-Lookup

CVE-2026-40165 (GCVE-0-2026-40165)

Vulnerability from cvelistv5 – Published: 2026-05-20 23:35 – Updated: 2026-05-21 14:13

Title

authentik: SAML NameID XML Comment Injection Enables Authentication Bypass via Identifier Truncation

Summary

authentik is an open-source identity provider. Versions 2025.12.4 and prior, and versions 2026.2.0-rc1 through 2026.2.2 were vulnerable to Authentication Bypass through SAML NameID XML Comment Injection. Due to how authentik extracted the NameID value from a SAML assertion, it was possible for an attacker to trick authentik into only seeing a part of the NameID value, potentially allowing an attacker to gain access to other accounts. This issue could be exploited on an authentik instance with a SAML Source, where the attacker had an account on the SAML Source and the ability to modify their NameID value (commonly username or E-mail), and XML Signing was enabled. The attacker could modify the SAML assertion given to authentik by injecting a comment within the NameID value, which effectively truncated the NameID value to the snippet before the comment, and gave the attacker access to any user account. This issue has been fixed in versions 2025.12.5 and 2026.2.3.

Severity

8.7 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-287 - Improper Authentication
CWE-91 - XML Injection (aka Blind XPath Injection)
CWE-436 - Interpretation Conflict

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/goauthentik/authentik/security…	x_refsource_CONFIRM
https://github.com/goauthentik/authentik/commit/4…	x_refsource_MISC
https://github.com/goauthentik/authentik/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
goauthentik	authentik	Affected: < 2025.12.5 Affected: >= 2026.2.0-rc1, < 2026.2.3

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-40165",
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bit-authentik-2026-40165

Vulnerability from bitnami_vulndb

Published

2026-05-25 14:36

Modified

2026-05-25 15:17

Summary

authentik: SAML NameID XML Comment Injection Enables Authentication Bypass via Identifier Truncation

Details

authentik is an open-source identity provider. Versions 2025.12.4 and prior, and versions 2026.2.0 through 2026.2.2 were vulnerable to Authentication Bypass through SAML NameID XML Comment Injection. Due to how authentik extracted the NameID value from a SAML assertion, it was possible for an attacker to trick authentik into only seeing a part of the NameID value, potentially allowing an attacker to gain access to other accounts. This issue could be exploited on an authentik instance with a SAML Source, where the attacker had an account on the SAML Source and the ability to modify their NameID value (commonly username or E-mail), and XML Signing was enabled. The attacker could modify the SAML assertion given to authentik by injecting a comment within the NameID value, which effectively truncated the NameID value to the snippet before the comment, and gave the attacker access to any user account. This issue has been fixed in versions 2025.12.5 and 2026.2.3.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "authentik",
        "purl": "pkg:bitnami/authentik"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2025.12.5"
            },
            {
              "introduced": "2026.2.0"
            },
            {
              "fixed": "2026.2.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40165"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "authentik is an open-source identity provider. Versions 2025.12.4 and prior, and versions 2026.2.0 through 2026.2.2 were vulnerable to Authentication Bypass through SAML NameID XML Comment Injection. Due to how authentik extracted the NameID value from a SAML assertion, it was possible for an attacker to trick authentik into only seeing a part of the NameID value, potentially allowing an attacker to gain access to other accounts. This issue could be exploited on an authentik instance with a SAML Source, where the attacker had an account on the SAML Source and the ability to modify their NameID value (commonly username or E-mail), and XML Signing was enabled. The attacker could modify the SAML assertion given to authentik by injecting a comment within the NameID value, which effectively truncated the NameID value to the snippet before the comment, and gave the attacker access to any user account. This issue has been fixed in versions 2025.12.5 and 2026.2.3.",
  "id": "BIT-authentik-2026-40165",
  "modified": "2026-05-25T15:17:13.809Z",
  "published": "2026-05-25T14:36:29.153Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/goauthentik/authentik/commit/47dec5c6b7fb4a62bfad2ae8bddf002bde7ba774"
    },
    {
      "type": "WEB",
      "url": "https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/goauthentik/authentik/security/advisories/GHSA-9wj8-xv4r-qwrp"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40165"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "authentik: SAML NameID XML Comment Injection Enables Authentication Bypass via Identifier Truncation"
}

FKIE_CVE-2026-40165

Vulnerability from fkie_nvd - Published: 2026-05-21 00:16 - Updated: 2026-06-17 10:44

Severity

8.7 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/goauthentik/authentik/commit/47dec5c6b7fb4a62bfad2ae8bddf002bde7ba774
	security-advisories@github.com	https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.5
	security-advisories@github.com	https://github.com/goauthentik/authentik/security/advisories/GHSA-9wj8-xv4r-qwrp

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "authentik",
          "vendor": "goauthentik",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2025.12.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.2.0-rc1, \u003c 2026.2.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "authentik is an open-source identity provider. Versions 2025.12.4 and prior, and versions 2026.2.0-rc1 through 2026.2.2 were vulnerable to Authentication Bypass through SAML NameID XML Comment Injection. Due to how authentik extracted the NameID value from a SAML assertion, it was possible for an attacker to trick authentik into only seeing a part of the NameID value, potentially allowing an attacker to gain access to other accounts. This issue could be exploited on an authentik instance with a SAML Source, where the attacker had an account on the SAML Source and the ability to modify their NameID value (commonly username or E-mail), and XML Signing was enabled. The attacker could modify the SAML assertion given to authentik by injecting a comment within the NameID value, which effectively truncated the NameID value to the snippet before the comment, and gave the attacker access to any user account. This issue has been fixed in versions 2025.12.5 and 2026.2.3."
    }
  ],
  "id": "CVE-2026-40165",
  "lastModified": "2026-06-17T10:44:48.190",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
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    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40165",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-21T14:13:10.961177Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-21T00:16:28.290",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/goauthentik/authentik/commit/47dec5c6b7fb4a62bfad2ae8bddf002bde7ba774"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/goauthentik/authentik/security/advisories/GHSA-9wj8-xv4r-qwrp"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-91"
        },
        {
          "lang": "en",
          "value": "CWE-287"
        },
        {
          "lang": "en",
          "value": "CWE-436"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-40165 (GCVE-0-2026-40165)

bit-authentik-2026-40165

Vulnerability from bitnami_vulndb

FKIE_CVE-2026-40165

Tags

Sightings

Nomenclature