CVE-2026-42849
authentik: Reflected XSS in SFE AutosubmitStage allows IDP account takeover
CVSS Score
9.3
EPSS Score
0.0%
EPSS Percentile
1th
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.
| CWE | CWE-79 |
| Vendor | goauthentik |
| Product | authentik |
| Published | Jun 2, 2026 |
| Last Updated | Jun 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
goauthentik / authentik
< 2025.12.5 < 2026.2.3