CVE-2026-42849

CriticalCVSS 9.3

Published: 02/06/2026(UTC)Updated: 22/07/2026(UTC)Translated: 23/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.36%

28th percentile - higher than 28% of all known CVEs

Summary

XSS vulnerability in the AutosubmitStage component in authentik (open-source identity provider) prior to versions 2025.12.5 and 2026.2.3, allowing an attacker to inject malicious scripts.

Risk Assessment

Risk of session theft and account takeover, potentially compromising the entire authentication system.

Recommendation

Update authentik to version 2025.12.5 or 2026.2.3. Restrict use of legacy browsers if possible.

Original NVD description (English source)

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.