CVE-2026-79313: n/a
web.py version 0.76 has an insufficient session expiration vulnerability. The session management depends on periodic cleanup rather than validating session last-access time upon loading. This allows expired sessions that have not yet been cleaned up to be reused, enabling attackers with a previously valid session cookie to access protected resources beyond the intended idle timeout.
AI Analysis
Technical Summary
The vulnerability in web.py 0.76 arises because the application does not verify the last-access time of a session when it is loaded. Instead, it relies on periodic cleanup tasks to remove expired sessions. Consequently, sessions that have expired but remain in storage until cleanup can be replayed by an attacker possessing a valid session cookie, bypassing the configured idle timeout and maintaining unauthorized access.
Potential Impact
An attacker who has obtained a previously valid session cookie can continue to access protected resources after the session should have expired due to idle timeout. This undermines session expiration controls and can lead to unauthorized access persistence.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider implementing additional session validation logic that checks the last-access time on session load or reducing the cleanup interval to minimize the window of exposure.
CVE-2026-79313: n/a
Description
web.py version 0.76 has an insufficient session expiration vulnerability. The session management depends on periodic cleanup rather than validating session last-access time upon loading. This allows expired sessions that have not yet been cleaned up to be reused, enabling attackers with a previously valid session cookie to access protected resources beyond the intended idle timeout.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in web.py 0.76 arises because the application does not verify the last-access time of a session when it is loaded. Instead, it relies on periodic cleanup tasks to remove expired sessions. Consequently, sessions that have expired but remain in storage until cleanup can be replayed by an attacker possessing a valid session cookie, bypassing the configured idle timeout and maintaining unauthorized access.
Potential Impact
An attacker who has obtained a previously valid session cookie can continue to access protected resources after the session should have expired due to idle timeout. This undermines session expiration controls and can lead to unauthorized access persistence.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider implementing additional session validation logic that checks the last-access time on session load or reducing the cleanup interval to minimize the window of exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-08-25T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6ab29537f7a7c541064ee1ad
Added to database: 09/22/2026, 14:48:23 UTC
Last enriched: 09/22/2026, 15:02:45 UTC
Last updated: 09/22/2026, 15:18:29 UTC
Views: 4
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