GHSA-c2gg-4gq4-jv5j is a critical-severity (CVSS 9.9) CWE-862 vulnerability in org.xwiki.platform:xwiki-platform-uiextension-api. 2 public exploit references exist, so weaponization risk is real. O3 Security confirms whether GHSA-c2gg-4gq4-jv5j is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
XWiki Platform remote code execution from account through UIExtension parameters
Real-World Exposure
org.xwiki.platform:xwiki-platform-uiextension-api☕org.xwiki.platform:xwiki-platform-uiextension-api☕org.xwiki.platform:xwiki-platform-uiextension-apiReal-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
Parameters of UI extensions are always interpreted as Velocity code and executed with programming rights. Any user with edit right on any document like the user's own profile can create UI extensions. This allows remote code execution and thereby impacts the confidentiality, integrity and availability of the whole XWiki installation.
To reproduce, edit your user profile with the object editor and add a UIExtension object with the following values:
Extension Point ID: org.xwiki.platform.panels.Applications
Extension ID: platform.panels.myFakeApplication
Extension parameters:
label=I got programming right: $services.security.authorization.hasAccess('programming')
target=Main.WebHome
targetQueryString=
icon=icon:bomb
Extension Scope: "Current User".
Save the document and open any document. If an application entry with the text "I got programming right: true" is displayed, the attack succeeded, if the code in "label" is displayed literally, the XWiki installation isn't vulnerable.
Patches
This vulnerability has been patched in XWiki 14.10.19, 15.5.4 and 15.9-RC1.
Workarounds
We're not aware of any workarounds apart from upgrading.
References
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.xwiki.platform:xwiki-platform-uiextension-api | all versions | 14.10.19 |
| ☕Maven | org.xwiki.platform:xwiki-platform-uiextension-api | ≥ 15.0-rc-1&&< 15.5.4 | 15.5.4 |
| ☕Maven | org.xwiki.platform:xwiki-platform-uiextension-api | ≥ 15.6-rc-1&&< 15.9-rc-1 | 15.9-rc-1 |
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 org.xwiki.platform:xwiki-platform-uiextension-api. 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-uiextension-api to 14.10.19 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c2gg-4gq4-jv5j 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-c2gg-4gq4-jv5j 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-c2gg-4gq4-jv5j. 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-c2gg-4gq4-jv5j in your dependencies?
O3 detects GHSA-c2gg-4gq4-jv5j across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.