GHSA-p9q8-7x22-5x77 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in cecil/cecil. 1 public exploit reference exists, so weaponization risk is real. A fix is available for cecil/cecil — see the affected versions and patch details below.
Cecil Cross-site Scripting vulnerability
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for GHSA-p9q8-7x22-5x77.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-p9q8-7x22-5x77 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
cecil/cecilReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Cross-site Scripting (XSS) - Reflected in GitHub repository cecilapp/cecil prior to 7.47.1.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | cecil/cecil | all versions | 7.47.1composer require cecil/cecil:^7.47.1 |
Affected Products
cecilcecilResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for cecil/cecil, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update cecil/cecil to 7.47.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-p9q8-7x22-5x77 is resolved across your whole dependency graph.
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
Is GHSA-p9q8-7x22-5x77 in your dependencies?
Find it across Packagist, including transitive dependencies.