CVE-2026-49443: authentik: `UserSourceConnection.user` and `GroupSourceConnection.group` are changeable through the API

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-06-02 · updated 2026-07-22
Weakness: CWE-287

Description

authentik is an open-source identity provider. Prior to versions 2025.12.6, 2026.2.4, and 2026.5.1, an attacker with the ability to change a source connection, and an account in one of the configured sources can log into any account. This issue has been patched in versions 2025.12.6, 2026.2.4, and 2026.5.1.

Affected products

goauthentik authentik: before 2025.12.6; from 2026.2.0 before 2026.2.4; from 2026.5.0 before 2026.5.1 — fixed in 2025.12.6, 2026.2.4, 2026.5.1

How to fix

Upgrade to a fixed version: goauthentik authentik 2025.12.6, 2026.2.4, 2026.5.1. Check the vendor advisory for mitigations.

References

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