CVE-2026-42849

CRITICAL EPSS 23.6%
Published Jun 2, 20264w ago · Modified Jun 17, 20262w ago
9.3 CVSS 3.1
Critical
Find Similar
Published Jun 2, 2026 4w ago
Last Modified Jun 17, 2026 2w ago

Description

authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, due to the implementation of stages in the SFE (Simple Flow Executor) in order to make the interface more compatible with legacy browsers, it was possible to use an XSS exploit in the AutosubmitStage. This issue has been patched in versions 2025.12.5 and 2026.2.3.

CVSS Details

Base Score
9.3
Exploitability
2.8
Impact
5.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
23.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 2

VendorProductVersionRange
goauthentikauthentik* <2025.12.5
goauthentikauthentik*≥2026.2.0  –  <2026.2.3

References 1

  • github.com https://github.com/goauthentik/authentik/security/advisories/GHSA-pgff-5mx8-fqj3
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.