CVE-2026-48911: Apache Answer: Unauthenticated OAuth Email-Binding Account Takeover via Existing User Confirmation Flow

[Enxin Xie <linkinstar () apache org>]

Severity: moderate 

Affected versions:

- Apache Answer through 2.0.1

Description:

Insufficient Verification of Data Authenticity vulnerability in Apache Answer.

This issue affects Apache Answer: through 2.0.1.

A missing authorization check in the external-login email binding flow allows unauthenticated attackers to take over 
arbitrary user accounts by tricking victims into clicking a crafted confirmation link.
Users are recommended to upgrade to version 2.0.2, which fixes the issue.

Credit:

tonghuaroot (reporter)
yangxi (reporter)

References:

https://answer.apache.org
https://www.cve.org/CVERecord?id=CVE-2026-48911