---
id: CVE-2020-25074
aliases:
  - GHSA-52q8-877j-gghq
  - PYSEC-2020-67
title: MoinMoin vulnerable to remote code execution via cache action
summary: MoinMoin vulnerable to remote code execution via cache action
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: moin
product: moin
ecosystem: pip
affected:
  - moin < 1.9.11
patched:
  - moin 1.9.11
published: '2020-11-11'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:48:35.542355415Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-52q8-877j-gghq'
references:
  - url: >-
      https://github.com/moinwiki/moin-1.9/security/advisories/GHSA-52q8-877j-gghq
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2020-25074'
  - url: >-
      https://github.com/moinwiki/moin-1.9/commit/6b96a9060069302996b5af47fd4a388fc80172b7
  - url: 'https://github.com/moinwiki/moin'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/moin/PYSEC-2020-67.yaml
  - url: 'https://lists.debian.org/debian-lts-announce/2020/11/msg00020.html'
  - url: 'https://pypi.org/project/moin'
  - url: 'https://www.debian.org/security/2020/dsa-4787'
  - url: 'http://moinmo.in/SecurityFixes'
tags:
  - osv
  - pip
epss: 0.06551
epssPercentile: 0.93557
ingestedAt: '2026-09-12T03:13:01.656Z'
---

## Overview

### Impact
The cache action in action/cache.py allows directory traversal through a crafted HTTP request. An attacker who can upload attachments to the wiki can use this to achieve remote code execution.

### Patches
Users are strongly advised to upgrade to a patched version.

MoinMoin Wiki 1.9.11 has the necessary fixes and also contains other important fixes.

### Workarounds
It is not advised to work around this, but to upgrade MoinMoin to a patched version.

That said, a work around via disabling the `cache` or the `AttachFile` action might be possible.

Also, it is of course helpful if you give `write` permissions (which include uploading attachments) only to trusted users.

### Credits

This vulnerability was discovered by Michael Chapman.

### For more information
If you have any questions or comments about this advisory, email me at [twaldmann@thinkmo.de](mailto:twaldmann@thinkmo.de).

## Affected packages

- `moin < 1.9.11`

## Remediation

Upgrade to a patched release:

- `moin 1.9.11`