CVE-2026-40104: Xwiki platform oldcore XWiki's REST APIs Can List Vulnerability

MODERATE
Advisory Identifier: GHSA-mrqg-xmgm-rc5g
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CVSS 8.2
CWE-770
Published
Advisory Summary

CVE-2026-40104 is a MODERATE (CVSS 8.2) xwiki's rest apis can list vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Xwiki platform oldcore libraries in the Maven ecosystem. The issue involves xwiki's rest apis can list all pages/spaces, leading to unavailability. Remediation is available by upgrading affected packages to version 16.10.16, 17.4.8, 17.10.1.

CVE-2026-40104 at a Glance

CVE Identifier CVE-2026-40104
GHSA Identifier GHSA-mrqg-xmgm-rc5g
Severity MODERATE
CVSS v3.1 Base Score 8.2
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Xwiki platform oldcore
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.2

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:N/S:U/C:L/I:N/A:H).

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

How to Fix CVE-2026-40104

To remediate this vulnerability, upgrade all affected Xwiki platform oldcore 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-oldcore fixed: 16.10.16 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-oldcore</artifactId>
    <version>16.10.16</version>
</dependency>
org.xwiki.platform:xwiki-platform-oldcore fixed: 17.4.8 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-oldcore</artifactId>
    <version>17.4.8</version>
</dependency>
org.xwiki.platform:xwiki-platform-oldcore fixed: 17.10.1 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-oldcore</artifactId>
    <version>17.10.1</version>
</dependency>
org.xwiki.platform:xwiki-platform-legacy-oldcore fixed: 16.10.16 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-legacy-oldcore</artifactId>
    <version>16.10.16</version>
</dependency>
org.xwiki.platform:xwiki-platform-legacy-oldcore fixed: 17.4.8 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-legacy-oldcore</artifactId>
    <version>17.4.8</version>
</dependency>
org.xwiki.platform:xwiki-platform-legacy-oldcore fixed: 17.10.1 
<dependency>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-legacy-oldcore</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-2026-40104, 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 oldcore 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. In Xwiki platform oldcore, 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 REST API endpoints like `/xwiki/rest/wikis/xwiki/spaces/AnnotationCode/pages/AnnotationConfig/objects/AnnotationCode.AnnotationConfig/0/properties` list all available pages as part of the metadata for database list properties, which can exhaust available resources on large wikis. ### Patches This problem has been patched by applying the configured query limit also to the available values for database list properties in XWiki 16.10.16, 17.4.8 and 17.10.1. ### Workarounds We're not aware of any workarounds apart from upgrading the affected modules.

CVE-2026-40104 Affected Xwiki platform oldcore Versions

6 component(s)
Fixed Versions:
16.10.1617.4.817.10.1
Product / Package Ecosystem Affected Versions Fixed Version
org.xwiki.platform:xwiki-platform-oldcore
maven/org.xwiki.platform/xwiki-platform-oldcore
Maven
≥ 1.8-rc-1
< 16.10.16
16.10.16
org.xwiki.platform:xwiki-platform-oldcore
maven/org.xwiki.platform/xwiki-platform-oldcore
Maven
≥ 17.0.0-rc-1
< 17.4.8
17.4.8
org.xwiki.platform:xwiki-platform-oldcore
maven/org.xwiki.platform/xwiki-platform-oldcore
Maven
≥ 17.5.0-rc-1
< 17.10.1
17.10.1
org.xwiki.platform:xwiki-platform-legacy-oldcore
maven/org.xwiki.platform/xwiki-platform-legacy-oldcore
Maven
≥ 1.8-rc-1
< 16.10.16
16.10.16
org.xwiki.platform:xwiki-platform-legacy-oldcore
maven/org.xwiki.platform/xwiki-platform-legacy-oldcore
Maven
≥ 17.0.0-rc-1
< 17.4.8
17.4.8
org.xwiki.platform:xwiki-platform-legacy-oldcore
maven/org.xwiki.platform/xwiki-platform-legacy-oldcore
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-mrqg-xmgm-rc5g
NVD — CVE-2026-40104 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40104
Security Fix Commit FIX COMMIT
https://github.com/xwiki/xwiki-platform/commit/47b568c4753a6e682b14be1ca581bdd3b25d45a7
Xwiki platform oldcore Source Repository REPOSITORY
https://github.com/xwiki/xwiki-platform
jira.xwiki.org/browse/xwiki-23550 WEB
https://jira.xwiki.org/browse/XWIKI-23550

Frequently Asked Questions

What is CVE-2026-40104?
CVE-2026-40104 is a security vulnerability in Xwiki platform oldcore involving XWiki's REST APIs can list all pages/spaces, leading to unavailability under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Xwiki platform oldcore 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-oldcore, org.xwiki.platform:xwiki-platform-legacy-oldcore.
What version fixes CVE-2026-40104?
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-oldcore affected?
Yes, org.xwiki.platform:xwiki-platform-oldcore 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.
Is xwiki-platform-legacy-oldcore affected?
Yes, org.xwiki.platform:xwiki-platform-legacy-oldcore 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-2026-40104?
CVE-2026-40104 has a CVSS v3.1 base score of 8.2 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.
What CWE is associated with CVE-2026-40104?
CVE-2026-40104 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check Maven dependencies for CVE-2026-40104?
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-mrqg-xmgm-rc5g",
  "modified" : "2026-04-24T20:29:17Z",
  "published" : "2026-04-14T22:34:04Z",
  "aliases" : [ "CVE-2026-40104" ],
  "summary" : "XWiki's REST APIs can list all pages/spaces, leading to unavailability",
  "details" : "### Impact\nREST API endpoints like `/xwiki/rest/wikis/xwiki/spaces/AnnotationCode/pages/AnnotationConfig/objects/AnnotationCode.AnnotationConfig/0/properties` list all available pages as part of the metadata for database list properties, which can exhaust available resources on large wikis.\n\n### Patches\nThis problem has been patched by applying the configured query limit also to the available values for database list properties in XWiki 16.10.16, 17.4.8 and 17.10.1.\n\n### Workarounds\nWe're not aware of any workarounds apart from upgrading the affected modules.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-oldcore"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.8-rc-1"
      }, {
        "fixed" : "16.10.16"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-oldcore"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "17.0.0-rc-1"
      }, {
        "fixed" : "17.4.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-oldcore"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "17.5.0-rc-1"
      }, {
        "fixed" : "17.10.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-legacy-oldcore"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.8-rc-1"
      }, {
        "fixed" : "16.10.16"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-legacy-oldcore"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "17.0.0-rc-1"
      }, {
        "fixed" : "17.4.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.xwiki.platform:xwiki-platform-legacy-oldcore"
    },
    "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-mrqg-xmgm-rc5g"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40104"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xwiki/xwiki-platform/commit/47b568c4753a6e682b14be1ca581bdd3b25d45a7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/xwiki/xwiki-platform"
  }, {
    "type" : "WEB",
    "url" : "https://jira.xwiki.org/browse/XWIKI-23550"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-14T22:34:04Z",
    "nvd_published_at" : "2026-04-15T04:17:47Z"
  }
}