CVE-2026-40105: Xwiki platform web templates Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-w4fj-87j5-f25c
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CVSS 6.1
CWE-80
Published
Advisory Summary

CVE-2026-40105 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)) affecting Xwiki platform web templates libraries in the Maven ecosystem. The issue involves xwiki has reflected cross-site scripting (xss) in page history compare. Remediation is available by upgrading affected packages to version 16.10.16, 17.4.8, 17.10.1.

CVE-2026-40105 at a Glance

CVE Identifier CVE-2026-40105
GHSA Identifier GHSA-w4fj-87j5-f25c
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Affected Product Xwiki platform web templates
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-40105

To remediate this vulnerability, upgrade all affected Xwiki platform web templates dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.xwiki.platform:xwiki-platform-web-templates fixed: 16.10.16 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-web-templates</artifactId>
    <version>16.10.16</version>
</dependency>
org.xwiki.platform:xwiki-platform-web-templates fixed: 17.4.8 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-web-templates</artifactId>
    <version>17.4.8</version>
</dependency>
org.xwiki.platform:xwiki-platform-web-templates fixed: 17.10.1 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-web-templates</artifactId>
    <version>17.10.1</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.xwiki.platform

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-40105, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.xwiki.platform

Analyze the terminal output to locate any version of Xwiki platform web templates in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 16.10.16), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.xwiki.platform command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS), where the product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. In Xwiki platform web templates, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact A reflected cross-site scripting vulnerability (XSS) in the compare 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. ### Patches The problem has been patched by properly escaping the URL parameters. ### Workarounds The [patch](https://github.com/xwiki/xwiki-platform/commit/3c8a2ec985641367015c2db937574fcd360c788c#diff-a5e75a4e3820a63c02a32666dda67c73ee7885ab8e7f67e52cfcb3be5a13326e) can be applied manually to `templates/changesdoc.vm` in the deployed WAR. ### Attribution XWiki thanks Mike Cole @mikecole-mg for discovering and reporting this vulnerability.

CVE-2026-40105 Affected Xwiki platform web templates Versions

3 component(s)
Fixed Versions:
16.10.1617.4.817.10.1
Product / Package Ecosystem Affected Versions Fixed Version
org.xwiki.platform:xwiki-platform-web-templates
maven/org.xwiki.platform/xwiki-platform-web-templates
Maven
≥ 10.4-rc-1
< 16.10.16
16.10.16
org.xwiki.platform:xwiki-platform-web-templates
maven/org.xwiki.platform/xwiki-platform-web-templates
Maven
≥ 17.0.0-rc-1
< 17.4.8
17.4.8
org.xwiki.platform:xwiki-platform-web-templates
maven/org.xwiki.platform/xwiki-platform-web-templates
Maven
≥ 17.5.0-rc-1
< 17.10.1
17.10.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-w4fj-87j5-f25c
NVD — CVE-2026-40105 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40105
Security Fix Commit FIX COMMIT
https://github.com/xwiki/xwiki-platform/commit/3c8a2ec985641367015c2db937574fcd360c788c
Xwiki platform web templates Source Repository REPOSITORY
https://github.com/xwiki/xwiki-platform
jira.xwiki.org/browse/xwiki-23472 WEB
https://jira.xwiki.org/browse/XWIKI-23472

Frequently Asked Questions

What is CVE-2026-40105?
CVE-2026-40105 is a security vulnerability in Xwiki platform web templates involving XWiki has Reflected Cross-Site Scripting (XSS) in page history compare under CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS).
Which Xwiki platform web templates versions are affected?
Affected versions include releases prior to 16.10.16, 17.4.8, 17.10.1 across affected packages: org.xwiki.platform:xwiki-platform-web-templates.
What version fixes CVE-2026-40105?
Upgrading to 16.10.16, 17.4.8, 17.10.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is xwiki-platform-web-templates affected?
Yes, org.xwiki.platform:xwiki-platform-web-templates is affected in releases prior to 16.10.16, 17.4.8, 17.10.1. Upgrade your dependency to 16.10.16, 17.4.8, 17.10.1 or later.
What is the CVSS score of CVE-2026-40105?
CVE-2026-40105 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2026-40105?
CVE-2026-40105 is classified under CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) (The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.).
How can I check Maven dependencies for CVE-2026-40105?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.xwiki.platform'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-w4fj-87j5-f25c",
  "modified" : "2026-04-27T15:02:22Z",
  "published" : "2026-04-14T22:33:56Z",
  "aliases" : [ "CVE-2026-40105" ],
  "summary" : "XWiki has Reflected Cross-Site Scripting (XSS) in page history compare",
  "details" : "### Impact\nA reflected cross-site scripting vulnerability (XSS) in the compare 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.\n\n### Patches\nThe problem has been patched by properly escaping the URL parameters.\n\n### Workarounds\nThe [patch](https://github.com/xwiki/xwiki-platform/commit/3c8a2ec985641367015c2db937574fcd360c788c#diff-a5e75a4e3820a63c02a32666dda67c73ee7885ab8e7f67e52cfcb3be5a13326e) can be applied manually to `templates/changesdoc.vm` in the deployed WAR.\n\n### Attribution\n\nXWiki thanks Mike Cole @mikecole-mg for discovering and reporting this vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-web-templates"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.4-rc-1"
      }, {
        "fixed" : "16.10.16"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-web-templates"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "17.0.0-rc-1"
      }, {
        "fixed" : "17.4.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-web-templates"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "17.5.0-rc-1"
      }, {
        "fixed" : "17.10.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-w4fj-87j5-f25c"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40105"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xwiki/xwiki-platform/commit/3c8a2ec985641367015c2db937574fcd360c788c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/xwiki/xwiki-platform"
  }, {
    "type" : "WEB",
    "url" : "https://jira.xwiki.org/browse/XWIKI-23472"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-80" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-14T22:33:56Z",
    "nvd_published_at" : "2026-04-15T04:17:48Z"
  }
}