Insufficient Session Expiration in web.py

Executive Summary

CVE-2026-79313 is an Insufficient Session Expiration vulnerability in web.py version 0.76. The framework's session management does not check the last-access time when loading a session. Instead, it only verifies if the session record exists. This allows expired sessions to remain active until a cleanup process removes them, creating a window where attackers with a valid session cookie can continue accessing protected resources after the session should have expired.

Useful 0 Not Useful 0

Detection Guidance

To detect this vulnerability, inspect web.py applications for session handling logic that does not verify last-access time. Check if sessions persist beyond their timeout without cleanup. Review application logs for repeated use of expired session cookies.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability allows attackers who obtain a valid session cookie to continue using it even after the session should have expired. This could lead to unauthorized access to sensitive functionality or data protected by the session until the next cleanup cycle removes the expired session record.

Useful 0 Not Useful 0

Mitigation Strategies

• Upgrade to a patched version of web.py once available.
• Implement application-level checks to verify session activity time against timeout thresholds.
• Reduce session timeout duration to minimize the exposure window for expired sessions.

Useful 0 Not Useful 0