CVE-2026-42849

EUVD-2026-34026
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.3 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 27%
Affected Products (NVD)
VendorProductVersion
goauthentikauthentik
𝑥
< 2025.12.5
goauthentikauthentik
2026.2.0 ≤
𝑥
< 2026.2.3
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/goauthentik/authentik/security/advisories/GHSA-pgff-5mx8-fqj3