What’s Vulnerable › Vulnerabilities

CVE-2026-40104: XWiki's REST APIs can list all pages/spaces, leading to unavailability

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-15 · updated 2026-10-26
• Weakness: CWE-770

Description

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Versions 1.8-rc-1, 17.0.0-rc-1 and 17.5.0-rc-1 and prior include a resource exhaustion vulnerability in REST API endpoints such as /xwiki/rest/wikis/xwiki/spaces/AnnotationCode/pages/AnnotationConfig/objects/AnnotationCode.AnnotationConfig/0/properties, which list all available pages as part of the metadata for database list properties without applying query limits. On large wikis, this can exhaust available server resources. This issue has been patched in versions 16.10.16, 17.4.8 and 17.10.1.

Affected products

• xwiki-platform: from 1.8 before 16.10.16; from 17.0.0 before 17.4.8; from 17.5.0 before 17.10.1 — fixed in 16.10.16, 17.4.8, 17.10.1

How to fix

Upgrade to a fixed version: xwiki-platform 16.10.16, 17.4.8, 17.10.1. Check the vendor advisory for mitigations.

References

• https://github.com/xwiki/xwiki-platform/commit/47b568c4753a6e682b14be1ca581bdd3b25d45a7
• https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-mrqg-xmgm-rc5g
• https://jira.xwiki.org/browse/XWIKI-23550

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