CVE-2026-42849: critical vulnerability in goauthentik authentik
authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.3epss 0.3%
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Affected products
goauthentik · authentikRelated CVEs — goauthentik authentik
In the same product, most dangerous first.
CVE-2022-46145HIGHauthentik vulnerable to unauthorized user creation and potential account takeoverEPSS 1.3%CVE-2023-48228HIGHOAuth2: PKCE can be fully circumventedEPSS 1.2%CVE-2024-52289HIGHauthentik has an insecure default configuration for OAuth2 Redirect URIsEPSS 1.1%CVE-2022-23555CRITICALauthentik vulnerable to Improper Authentication via invitation URL token reuseEPSS 0.9%CVE-2026-25227CRITICALauthentik affected by Remote Code Execution via Context Key Injection in PropertyMapping Test EndpointEPSS 0.9%CVE-2023-46249CRITICALauthentik potential installation takeover when default admin user is deletedEPSS 0.8%