GHSA-j4h6-gcj7-7v9v
HIGHdecidim-meetings Cross-site scripting vulnerability in the online or hybrid meeting embeds
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.
Blast Radius
decidim-meetingsReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
Impact
The meeting embeds feature used in the online or hybrid meetings is subject to potential XSS attack through a malformed URL.
Patches
Not available
Workarounds
Disable the creation of meetings by participants in the meeting component.
References
OWASP ASVS v4.0.3-5.1.3
Credits
This issue was discovered in a security audit organized by mitgestalten Partizipationsbüro against Decidim. The security audit was implemented by the Austrian Institute of Technology.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | decidim-meetings | ≥ 0.28.0&&< 0.28.3 | 0.28.3 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for decidim-meetings. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update decidim-meetings to 0.28.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-j4h6-gcj7-7v9v 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 pinpoints whether GHSA-j4h6-gcj7-7v9v is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-j4h6-gcj7-7v9v. 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-j4h6-gcj7-7v9v in your dependencies?
O3 detects GHSA-j4h6-gcj7-7v9v across RubyGems dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.