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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.

PUBLISHED Reserved 2026-04-30 | Published 2026-06-02 | Updated 2026-06-03 | Assigner GitHub_M




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

Problem types

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

Product status

< 2025.12.5
affected

< 2026.2.3
affected

References

github.com/...hentik/security/advisories/GHSA-pgff-5mx8-fqj3

cve.org (CVE-2026-42849)

nvd.nist.gov (CVE-2026-42849)

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