CVE-2026-42849

authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover

State: Published
Severity: 9.3 Critical
Published: Jun 2, 2026
Updated: Jun 3, 2026
Reserved: Apr 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.3 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
authentikgoauthentik	< 2025.12.5Affected < 2026.2.3Affected

References

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

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