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OpenAdvisories
Critical · 9.3 CVE-2026-42849 EUVD-2026-34026

authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover

Published Jun 2, 2026 · Updated Jun 3, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
goauthentik authentik < 2025.12.5, < 2026.2.3 —

References