GHSA-wcg9-pgqv-xm5v
CRITICALXWiki Platform allows XSS through XClass name in string properties
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
org.xwiki.platform:xwiki-platform-oldcore☕org.xwiki.platform:xwiki-platform-oldcore☕org.xwiki.platform:xwiki-platform-oldcore☕org.xwiki.platform:xwiki-platform-oldcoreReal-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
Impact
Is it possible for a user without Script or Programming rights to craft a URL pointing to a page with arbitrary JavaScript. This requires social engineer to trick a user to follow the URL.
Reproduction steps
- As a user without script or programming right, create a (non-terminal) document named
" + alert(1) + "(the quotes need to be part of the name). - Edit the class.
- Add a string property named
"test". - Edit using the object editor and add an object of the created class
- Get an admin to open
<xwiki-server>/xwiki/bin/view/%22%20%2B%20alert(1)%20%2B%20%22/?viewer=display&type=object&property=%22%20%2B%20alert(1)%20%2B%20%22.WebHome.test&mode=editwhere<xwiki-server>is the URL of your XWiki installation.
Patches
This has been patched in XWiki 14.10.21, 15.5.5, 15.10.6 and 16.0.0.
Workarounds
We're not aware of any workaround except upgrading.
References
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.xwiki.platform:xwiki-platform-oldcore | ≥ 1.1.2&&< 14.10.21 | 14.10.21 |
| ☕Maven | org.xwiki.platform:xwiki-platform-oldcore | ≥ 15.0-rc-1&&< 15.5.5 | 15.5.5 |
| ☕Maven | org.xwiki.platform:xwiki-platform-oldcore | ≥ 15.6-rc-1&&< 15.10.6 | 15.10.6 |
| ☕Maven | org.xwiki.platform:xwiki-platform-oldcore | ≥ 16.0.0-rc-1&&< 16.0.0 | 16.0.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.xwiki.platform:xwiki-platform-oldcore. 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.xwiki.platform:xwiki-platform-oldcore to 14.10.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wcg9-pgqv-xm5v 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-wcg9-pgqv-xm5v 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-wcg9-pgqv-xm5v. 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-wcg9-pgqv-xm5v in your dependencies?
O3 detects GHSA-wcg9-pgqv-xm5v across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.