Observable Response Discrepancy in authentik - CVE-2023-39522
Published: August 29, 2023 / Updated: April 23, 2026
Vulnerability identifier: #VU127142
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2023-39522
CWE-ID: CWE-204
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
authentik
authentik
Software vendor:
Authentik Security Inc
Authentik Security Inc
Description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to observable response discrepancy in the recovery flow identification stage when handling recovery flow requests. A remote attacker can submit crafted username or email values to disclose sensitive information.
Only setups configured with a recovery flow are vulnerable, and enumeration may be possible by username, email, or both depending on configuration.
Remediation
Install security update from vendor's website.