---
id: CVE-2026-79313
title: webpy web.py 0.76 is vulnerable to Insufficient Session Expiration
summary: >-
  webpy web.py 0.76 is vulnerable to Insufficient Session Expiration. The
  application's session management relies on periodic cleanup to expire sessions
  instead of checking the last-access time when a session is loaded. As a
  result, an exp…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-613
published: '2026-09-22'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:17:08.790'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-79313'
references:
  - url: 'https://github.com/lichoin/TraceLoom/blob/main/CVEs/CVE-2026-79313.md'
    label: cve@mitre.org
  - url: 'https://github.com/webpy/webpy'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-22T19:17:08.146478Z'
ingestedAt: '2026-09-22T15:05:01.082Z'
epss: 0.00556
epssPercentile: 0.45246
---

## Overview

webpy web.py 0.76 is vulnerable to Insufficient Session Expiration. The application's session management relies on periodic cleanup to expire sessions instead of checking the last-access time when a session is loaded. As a result, an expired session whose record has not yet been cleaned up can still be replayed and used, allowing an attacker holding a previously valid session cookie to continue accessing protected resources after the configured idle timeout.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.