goauthentik up to 2025.12.4/2026.2.2/2026.5.0 Source ACS Endpoint assertion

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in goauthentik authentik up to 2025.12.4/2026.2.2/2026.5.0. Impacted is an unknown function of the component Source ACS Endpoint. Executing a manipulation can lead to assertion. This vulnerability is tracked as CVE-2026-47201. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in goauthentik authentik up to 2025.12.4/2026.2.2/2026.5.0 and classified as problematic. This vulnerability affects an unknown function of the component Source ACS Endpoint. The manipulation with an unknown input leads to a assertion vulnerability. The CWE definition for the vulnerability is CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

authentik is an open-source identity provider. Prior to versions 2025.12.5, 2026.2.3, and 2026.5.1, authentik's SAML Source ACS endpoint is vulnerable to XML Signature Wrapping when validating upstream SAML responses. An attacker with any account at the upstream IdP can reuse a valid signed assertion to authenticate as another federated user. This issue has been patched in versions 2025.12.5, 2026.2.3, and 2026.5.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-47201 since 05/19/2026. The exploitation appears to be difficult. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available.

Upgrading to version 2025.12.5, 2026.2.3 or 2026.5.1 eliminates this vulnerability.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Assertion
CWE: CWE-617
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: authentik 2025.12.5/2026.2.3/2026.5.1

Timelineinfo

05/19/2026 CVE reserved
06/02/2026 +14 days VulDB entry created
06/03/2026 +0 days Advisory disclosed
06/03/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-c3m2-jqmq-pvp3
Status: Confirmed

CVE: CVE-2026-47201 (🔒)
GCVE (CVE): GCVE-0-2026-47201
GCVE (VulDB): GCVE-100-368032

Entryinfo

Created: 06/03/2026 01:32
Changes: 06/03/2026 01:32 (64)
Complete: 🔍
Cache ID: 216::103

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