GHSA-mfv8-q39f-mgfg is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in invenio-communities. A fix is available for invenio-communities — see the affected versions and patch details below.
Cross-site Scripting in invenio-communities
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-mfv8-q39f-mgfg 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 377,238 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
invenio-communitiesReal-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 Jinja templates
Impact
A Cross-Site Scripting (XSS) vulnerability was discovered in two Jinja templates in the Invenio-Communities module. The vulnerability allows a user to create a new community and include script element tags inside the description and page fields.
Patches
The problem has been patched in v1.0.0a20.
For more information
If you have any questions or comments about this advisory:
- Email us at [email protected]
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | invenio-communities | all versions | 1.0.0a20pip install --upgrade 'invenio-communities==1.0.0a20' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for invenio-communities, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update invenio-communities to 1.0.0a20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mfv8-q39f-mgfg 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-mfv8-q39f-mgfg can be triaged on real exposure rather than presence alone.
Tailored to GHSA-mfv8-q39f-mgfg. 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-mfv8-q39f-mgfg in your dependencies?
O3 Security finds GHSA-mfv8-q39f-mgfg across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.