Apache Answer lacks an authorization check during the external-login email binding process, allowing attackers to hijack user accounts by delivering a crafted confirmation link that the victim clicks. The flaw is a missing authentication/authorization control (CWE-306) that can result in complete account takeover.

Apache Answer versions up to and including 2.0.1 are affected. The issue was addressed in version 2.0.2 and later.

The vulnerability requires an attacker to obtain a victim’s click on a maliciously crafted confirmation link. This social engineering path is relatively low effort, with no additional system access needed to execute the flaw. The EPSS score of 0.17% indicates a very low but non‑zero probability of exploitation, and the vulnerability is not listed in CISA’s KEV catalog. Nonetheless, because the flaw permits unauthorized account takeover, the risk to confidentiality and integrity is substantial. The CVSS score of 7.5 reflects moderate to high severity, emphasizing the need for prompt remediation.