CVE-2026-40105
CVE-2026-40105 is a security vulnerability in org.xwiki.platform:xwiki-platform-web-templates. O3 Security confirms whether CVE-2026-40105 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
XWiki has Reflected Cross-Site Scripting (XSS) in its page history compare functionality
Blast Radius
org.xwiki.platform:xwiki-platform-web-templates☕org.xwiki.platform:xwiki-platform-web-templates☕org.xwiki.platform:xwiki-platform-web-templatesReal-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
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Versions 10.4-rc-1, through 16.10.15, 17.0.0-rc-1, through 17.4.7 and 17.5.0-rc-1 through 17.10.0 contain a reflected cross-site scripting vulnerability (XSS) in the comparison view between revisions of a page allows executing JavaScript code in the user's browser. If the current user is an admin, this can not only affect the current user but also the confidentiality, integrity and availability of the whole XWiki instance. If developers are unable to update immediately, they can apply the patch manually to templates/changesdoc.vm in the deployed WAR.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.xwiki.platform:xwiki-platform-web-templates | ≥ 10.4-rc-1&&< 16.10.16 | 16.10.16 |
| ☕Maven | org.xwiki.platform:xwiki-platform-web-templates | ≥ 17.0.0-rc-1&&< 17.4.8 | 17.4.8 |
| ☕Maven | org.xwiki.platform:xwiki-platform-web-templates | ≥ 17.5.0-rc-1&&< 17.10.1 | 17.10.1 |
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-web-templates. 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-web-templates to 16.10.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-40105 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 CVE-2026-40105 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 CVE-2026-40105. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-40105 in your dependencies?
O3 detects CVE-2026-40105 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.