GHSA-fc72-v54c-x9jg — moin
MEDIUMGHSA-fc72-v54c-x9jg is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in moin. 3 public exploit references exist, so weaponization risk is real. A fix is available for moin — see the affected versions and patch details below.
MoinMoin Cross-site Scripting (XSS) vulnerability
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-fc72-v54c-x9jg plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,166 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
moin🐍moinReal-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
Cross-site scripting (XSS) vulnerability in action/Despam.py in the Despam action module in MoinMoin 1.8.7 and 1.9.2 allows remote authenticated users to inject arbitrary web script or HTML by creating a page with a crafted URI.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | moin | ≥ 1.9.0&&< 1.9.3 | 1.9.3pip install --upgrade 'moin==1.9.3' |
| 🐍PyPI | moin | ≥ 1.8.0&&< 1.8.8 | 1.8.8pip install --upgrade 'moin==1.8.8' |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Cross-site scripting (XSS) vulnerability in action/Despam.py in the Desp…
Cross-site scripting (XSS) vulnerability in action/Despam.py in the Desp…
Cross-site scripting (XSS) vulnerability in action/Despam.py in the Desp…
Detection & mitigation playbook
Open-source dependencyDetect
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.
Fix
Update moin to 1.9.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fc72-v54c-x9jg is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-fc72-v54c-x9jg can be triaged on real exposure rather than presence alone.
Tailored to GHSA-fc72-v54c-x9jg. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-fc72-v54c-x9jg in your dependencies?
O3 Security finds GHSA-fc72-v54c-x9jg across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.