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CVE-2026-40105 — xwiki-platform-web-templa…

Fix: xwiki/xwiki-platform@3c8a2ec

CVE-2026-40105 is a CWE-80 vulnerability in org.xwiki.platform:xwiki-platform-web-templates. A fix is available for org.xwiki.platform:xwiki-platform-web-templates — see the affected versions and patch details below.

XWiki has Reflected Cross-Site Scripting (XSS) in its page history compare functionality

Also known asGHSA-w4fj-87j5-f25c
Published
Apr 15, 2026
Updated
Aug 12, 2026
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Sep 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-40105.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs45th percentile — riskier than 45% of all scored CVEsHighest risk

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.

Real-World Exposure

3 pkgs affected
☕org.xwiki.platform:xwiki-platform-web-templates☕org.xwiki.platform:xwiki-platform-web-templates☕org.xwiki.platform:xwiki-platform-web-templates

Real-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

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.xwiki.platform:xwiki-platform-web-templates≥ 10.4-rc-1&&< 16.10.1616.10.16org.xwiki.platform:xwiki-platform-web-templates:16.10.16
☕Mavenorg.xwiki.platform:xwiki-platform-web-templates≥ 17.0.0-rc-1&&< 17.4.817.4.8org.xwiki.platform:xwiki-platform-web-templates:17.4.8
☕Mavenorg.xwiki.platform:xwiki-platform-web-templates≥ 17.5.0-rc-1&&< 17.10.117.10.1org.xwiki.platform:xwiki-platform-web-templates:17.10.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.xwiki.platform:xwiki-platform-web-templates, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. 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.

  3. 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.

  4. How O3 protects you

    O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-40105 can be triaged on real exposure rather than presence alone.

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.

How to detect CVE-2026-40105

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2026-40105 -u https://target
Template
XWiki - Cross-Site Scripting
Severity
medium
Impact
Attackers can execute JavaScript in users' browsers, potentially compromising admin accounts and the entire XWiki instance.
Remediation
Update to a version later than 17.10.0 or apply the patch to templates/changesdoc.vm manually.

Template by ProjectDiscovery nuclei-templates (ritikchaddha), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

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
O3 Security · Impact-Aware SCA

Is CVE-2026-40105 in your dependencies?

O3 Security finds CVE-2026-40105 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works
CVE-2026-40105: xwiki-platform-web XSS | O3 Security