GHSA-9c8w-jrw3-q2c3 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.owasp.antisamy:antisamy. O3 Security confirms whether GHSA-9c8w-jrw3-q2c3 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Cross-site Scripting in OWASP AntiSamy
Real-World Exposure
org.owasp.antisamy:antisamyReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
OWASP AntiSamy before 1.6.4 allows XSS via HTML attributes when using the HTML output serializer (XHTML is not affected). This was demonstrated by a javascript: URL with : as the replacement for the : character.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.owasp.antisamy:antisamy | ≥ 1.5.7&&< 1.6.4 | 1.6.4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.owasp.antisamy:antisamy. 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 org.owasp.antisamy:antisamy to 1.6.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9c8w-jrw3-q2c3 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-9c8w-jrw3-q2c3 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-9c8w-jrw3-q2c3. 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-9c8w-jrw3-q2c3 in your dependencies?
O3 detects GHSA-9c8w-jrw3-q2c3 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.