CVE-2026-25748Network attack vector

Unauthenticated application access via malformed session cookie

Published Feb 12, 2026 · Updated Feb 12, 2026

Authentication bypass in authentik before 2025.10.4 and 2025.12.4 allows remote attackers to access protected applications. A malformed session cookie makes the Proxy Provider omit all X-Authentik-* identity headers during Traefik or Caddy forward authentication. Exposure requires an upstream application that treats those missing headers as authorization, allowing attackers to read its protected data.

CVSS severity8.6
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in authentik before 2025.10.4 and 2025.12.4 allows remote attackers to access protected applications. A malformed session cookie makes the Proxy Provider omit all X-Authentik-* identity headers during Traefik or Caddy forward authentication. Exposure requires an upstream application that treats those missing headers as authorization, allowing attackers to read its protected data.

The record

CVE
CVE-2026-25748
Published
Feb 12, 2026
Updated
Feb 12, 2026
Vendor
Authentik Security Inc.
Product
authentik
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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=>= 2025.10.0-rc1, < 2025.10.4
  2. Affected versionversion=>= 2025.10.0-rc1, < 2025.12.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Authentik Security Inc. · authentikversion=>= 2025.10.0-rc1, < 2025.10.4; version=>= 2025.10.0-rc1, < 2025.12.4

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.6GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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