CVE-2026-42849

critical · 9.3

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.

9.3

CVSS

0.4%

EPSS (exploit prob.)

29th

EPSS percentile

2026-06-02

Published

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

Weaknesses

CWE-79

Affected products

Vendor	Product	Affected versions
goauthentik	authentik	< 2025.12.5
goauthentik	authentik	>= 2026.2.0, < 2026.2.3

Check a specific version with /api/v1/cve/match.

References

https://github.com/goauthentik/authentik/security/advisories/GHSA-pgff-5mx8-fqj3

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-42849