CVE-2026-49443: authentik: `UserSourceConnection.user` and `GroupSourceConnection.group` are changeable through the API
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
authentikto a version that resolves this vulnerability.Fixed in 2025.12.6 - Upgrade
Upgrade
authentikto a version that resolves this vulnerability.Fixed in 2026.2.4 - Upgrade
Upgrade
authentikto a version that resolves this vulnerability.Fixed in 2026.5.1
Event History
Frequently Asked Questions
What is the severity of CVE-2026-49443?
The severity of CVE-2026-49443 is rated high with a score of 8.8.
What does CVE-2026-49443 impact?
CVE-2026-49443 impacts authentik, an open-source identity provider, allowing unauthorized access through API vulnerabilities.
How do I fix CVE-2026-49443?
To fix CVE-2026-49443, upgrade to versions 2025.12.6, 2026.2.4, or 2026.5.1 of authentik.
Who is affected by CVE-2026-49443?
Any authentik user with the ability to change a source connection and an account in a configured source is potentially affected by CVE-2026-49443.
What actions should I take regarding CVE-2026-49443?
It is recommended to update your authentik installation immediately to the latest patched version to mitigate CVE-2026-49443.