---
title: "CVE-2026-79313: webpy web.py - Authentication Bypass"
description: "webpy web.py 0.76 contains an insufficient session expiration vulnerability caused by reliance on periodic cleanup instead of last-access time checks, letting attackers replay expired sessions to access protected resources."
url: https://panop.io/threat-heartbeat/CVE-2026-79313/
---

# CVE-2026-79313 webpy web.py - Authentication Bypass

webpy web.py 0.76 contains an insufficient session expiration vulnerability caused by reliance on periodic cleanup instead of last-access time checks, letting attackers replay expired sessions to access protected resources.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.38% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-79313)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

22 September 2026

Updated

15 October 2026

Weakness

[CWE-613](https://cwe.mitre.org/data/definitions/613.html)

## Vendor fix

Update to the latest version of web.py.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-79313](https://nvd.nist.gov/vuln/detail/CVE-2026-79313)
- [https://github.com/lichoin/TraceLoom/blob/main/CVEs/CVE-2026-79313.md](https://github.com/lichoin/TraceLoom/blob/main/CVEs/CVE-2026-79313.md)
- [https://github.com/webpy/webpy](https://github.com/webpy/webpy)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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