GHSA-2hfj-cxw7-g45p
HIGHGHSA-2hfj-cxw7-g45p is a high-severity (CVSS 8.2) Cross-site Scripting (XSS) vulnerability in github.com/owncast/owncast. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-2hfj-cxw7-g45p is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Unsafe inline XSS in pasting DOM element into chat
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-2hfj-cxw7-g45p 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 365,017 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
github.com/owncast/owncastReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Impact
Inline scripts are executed when Javascript is parsed via a paste action.
- Open https://watch.owncast.online/
- Copy and then paste
<img src=null onerror=alert('hello')>into the chat field. - An alert should pop up.
Patches
⋮ 13 │ // Content security policy
⋮ 14 │ csp := []string{
⋮ 15 │ "script-src 'self' 'sha256-2HPCfJIJHnY0NrRDPTOdC7AOSJIcQyNxzUuut3TsYRY='",
⋮ 16 │ "worker-src 'self' blob:", // No single quotes around blob:
⋮ 17 │ }
Will be patched in 0.0.9 by blocking unsafe-inline Content Security Policy and specifying the script-src. The worker-src is required to be set to blob for the video player.
For more information
If you have any questions or comments about this advisory:
- Open an issue in owncast/owncast
- Email us at [email protected]
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/owncast/owncast | all versions | 0.0.9 |
Research 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 github.com/owncast/owncast. 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 github.com/owncast/owncast to 0.0.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2hfj-cxw7-g45p 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-2hfj-cxw7-g45p 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-2hfj-cxw7-g45p. 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-2hfj-cxw7-g45p in your dependencies?
O3 detects GHSA-2hfj-cxw7-g45p across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.