GHSA-gcqv-f29m-67gr
MEDIUMGHSA-gcqv-f29m-67gr is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in october/rain. O3 Security confirms whether GHSA-gcqv-f29m-67gr is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
October Rain has Stored XSS via SVG Filter Bypass
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
october/rain🐘october/rainReal-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
A stored cross-site scripting (XSS) vulnerability was identified in the SVG sanitization logic. The regex pattern used to strip on* event handler attributes could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries.
Impact
- Stored XSS via malicious SVG files uploaded through the Media Manager
- Could allow privilege escalation if a superuser views or embeds the malicious SVG
- Requires authenticated backend access with media upload permissions (
media.library.create) - SVG must be viewed or embedded in a page to trigger
Patches
The vulnerability has been patched in v3.7.14 and v4.1.10. All users are encouraged to upgrade to the latest patched version.
Workarounds
If upgrading immediately is not possible:
- Disable SVG uploads by adding
svgto the blocked extensions in media configuration - Set
media.clean_vectorstotruein configuration (enabled by default)
References
- Reported by Pentest-Tools.com
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | october/rain | ≥ 4.0.0&&< 4.1.10 | 4.1.10 |
| 🐘Packagist | october/rain | all versions | 3.7.14 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for october/rain. 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 october/rain to 4.1.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gcqv-f29m-67gr 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-gcqv-f29m-67gr 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-gcqv-f29m-67gr. 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-gcqv-f29m-67gr in your dependencies?
O3 detects GHSA-gcqv-f29m-67gr across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.