Apache Answer 2.0.3 Fixes Email Code Confusion Flaw

Apache Answer 2.0.3 addresses a moderate severity authorization flaw that could allow account takeover through email code confusion. The vulnerability affects all versions of the software up to and including 2.0.2.

What happened

According to an advisory posted to the oss-security mailing list by Enxin Xie on October 15, Apache Answer contains a flaw in how it handles email-based verification codes. The issue, tracked as CVE-2026-67249, stems from the failure to properly enforce the specific purpose of a generated code.

A verification code issued for one email-based workflow could be accepted by another sensitive workflow because the code purpose was not properly enforced. This lack of strict separation between workflows creates a path for unauthorized access.

Credit for discovering the vulnerability goes to Arpit Jain. The advisory states that users are recommended to upgrade to version 2.0.3, which fixes the issue. This release follows a previous update in October 2026 that addressed a different metadata leak vulnerability in the same product.

Why it matters

The ability to reuse verification codes across different workflows undermines the integrity of the authentication process. Attackers could potentially leverage this confusion to bypass security controls intended to verify user identity during sensitive actions.

While the source material describes the impact as potentially allowing account takeover, the exact exploitation scenario depends on the specific workflows configured in the deployment. The moderate severity rating reflects the risk of unauthorized access rather than immediate, widespread compromise.

This incident highlights the importance of strict state management in authentication flows. Developers must ensure that verification tokens are tightly bound to their intended purpose and cannot be repurposed for other critical operations.

What to watch

• Monitor official Apache Answer channels for further updates or security advisories.
• Review logs for unusual patterns in email verification usage across different workflows.
• Check for any other components in your environment that might rely on similar code reuse mechanisms.
• Validate that all instances of Apache Answer are running the patched version after deployment.

Who needs to act first

Teams usually prioritize systems exposed to the internet or those handling high-value user data. Check whether your deployment uses email verification for sensitive operations like password resets or account creation. Test the update in a non-production environment first to ensure compatibility. Back up your current configuration before applying the patch. If a fix is not yet available, consider restricting access to the application or adding additional monitoring to detect anomalous verification attempts.

What to do and how to stay safe: Apache Answer

• Identify all instances of Apache Answer running versions prior to 2.0.3 in your environment.
• Schedule an immediate upgrade to version 2.0.3 to close the vulnerability window.
• Review your authentication workflows to ensure verification codes are properly scoped and invalidated after use.
• Monitor system logs for any signs of unauthorized access attempts following the update.

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General security guidance from the Patch Gazette newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

Which versions of Apache Answer are affected by CVE-2026-67249?

All versions of Apache Answer through 2.0.2 are affected by this vulnerability.

Is there a fix available for this vulnerability?

Yes, version 2.0.3 fixes the issue and users are recommended to upgrade.

Who discovered this vulnerability?

The vulnerability was reported by Arpit Jain.