CVE-2026-42849 PUBLISHED

authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover

Assigner: GitHub_M
Reserved: 30.04.2026 Published: 02.06.2026 Updated: 02.06.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	goauthentik
Product	authentik
Versions	Version < 2025.12.5 is affected Version < 2026.2.3 is affected

References

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

Problem Types

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