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MEDIUM severity

MoinMoin Cross-site Scripting (XSS) vulnerabilityGHSA-4pfg-2frf-f67v

MEDIUM

GHSA-4pfg-2frf-f67v is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in moin. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for moin — see the affected versions and patch details below.

Also known asCVE-2009-1482PYSEC-2009-6
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.5%probability of exploitation in next 30 days
Lower Risk-0.01%
Lower risk than most CVEs85th percentile — riskier than 85% of all scored CVEsHighest risk
1.21%1.81%2.40%3.00%1.7%2.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍moin

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Multiple cross-site scripting (XSS) vulnerabilities in action/AttachFile.py in MoinMoin 1.8.2 and earlier allow remote attackers to inject arbitrary web script or HTML via (1) an AttachFile sub-action in the error_msg function or (2) multiple vectors related to package file errors in the upload_form function, different vectors than CVE-2009-0260.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPImoinall versions1.8.3pip install --upgrade 'moin==1.8.3'

Affected Products

2 products · 40 configurations
Application
moinmoinmoinmo
1 version
1.6.1
Application
moinmoinmoinmoin
≤ 1.8.2
38 versions
0.10.20.30.70.80.90.100.111.01.11.21.2.1
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Multiple cross-site scripting (XSS) vulnerabilities in action/AttachFile…

hg.moinmo.inNVDAug 2017

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for moin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update moin to 1.8.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4pfg-2frf-f67v is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Multiple cross-site scripting (XSS) vulnerabilities in `action/AttachFile.py` in MoinMoin 1.8.2 and earlier allow remote attackers to inject arbitrary web script or HTML via (1) an AttachFile sub-action in the `error_msg` function or (2) multiple vectors related to package file errors in the `upload_form` function, different vectors than CVE-2009-0260.
O3 Security · Impact-Aware SCA

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MoinMoin Cross-site Scripting (XSS) vulnerability