What is CVE-2026-40104?

CVE-2026-40104 is a high-severity vulnerability in Xwiki Org.xwiki.platform:xwiki-Platform-Legacy-Oldcore, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 8.2/10. Published 2026-04-15.

How severe is CVE-2026-40104?

High severity. CVSS v3 base score is 8.2 out of 10.

Resource exhaustion in Xwiki Org.xwiki.platform:xwiki-Platform-Legacy-Oldcore

CVE-2026-40104

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.

Published 2026-04-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003

Affected products

Xwiki Org.xwiki.platform:xwiki-Platform-Legacy-Oldcore — versions >= 1.8-rc-1, < 16.10.16, >= 17.0.0-rc-1, < 17.4.8, >= 17.5.0-rc-1, < 17.10.1
Xwiki Org.xwiki.platform:xwiki-Platform-Oldcore — versions >= 1.8-rc-1, < 16.10.16, >= 17.0.0-rc-1, < 17.4.8, >= 17.5.0-rc-1, < 17.10.1
Xwiki

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/xwiki/xwiki-platform/security/advisories/GHSA-mrqg-xmgm-rc5g (Vendor Advisory)
github.com/xwiki/xwiki-platform/commit/47b568c4753a6e682b14be1ca581bdd3b25d45a7 (Patch)
jira.xwiki.org/browse/XWIKI-23550 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40104?: CVE-2026-40104 is a high-severity vulnerability in Xwiki Org.xwiki.platform:xwiki-Platform-Legacy-Oldcore, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 8.2/10. Published 2026-04-15.
How severe is CVE-2026-40104?: High severity. CVSS v3 base score is 8.2 out of 10.