Your RSA-2048 keys break in 2030. Find every one of them before attackers do.
☕ Maven
Not in CISA KEV

CVE-2026-40104 — xwiki-platform-oldcore

Fix: xwiki/xwiki-platform@47b568c

CVE-2026-40104 is a CWE-770 vulnerability in org.xwiki.platform:xwiki-platform-oldcore. A fix is available for org.xwiki.platform:xwiki-platform-oldcore — see the affected versions and patch details below.

XWiki's REST APIs can list all pages/spaces, leading to unavailability

Also known asGHSA-mrqg-xmgm-rc5g
Published
Apr 15, 2026
Updated
Aug 12, 2026
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed
Exploitation data as of Sep 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • 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-2026-40104.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs34th percentile — riskier than 34% 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

6 pkgs affected
☕org.xwiki.platform:xwiki-platform-oldcore☕org.xwiki.platform:xwiki-platform-oldcore☕org.xwiki.platform:xwiki-platform-oldcore☕org.xwiki.platform:xwiki-platform-legacy-oldcore☕org.xwiki.platform:xwiki-platform-legacy-oldcore☕org.xwiki.platform:xwiki-platform-legacy-oldcore

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 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 Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.xwiki.platform:xwiki-platform-oldcore≥ 1.8-rc-1&&< 16.10.1616.10.16org.xwiki.platform:xwiki-platform-oldcore:16.10.16
☕Mavenorg.xwiki.platform:xwiki-platform-oldcore≥ 17.0.0-rc-1&&< 17.4.817.4.8org.xwiki.platform:xwiki-platform-oldcore:17.4.8
☕Mavenorg.xwiki.platform:xwiki-platform-oldcore≥ 17.5.0-rc-1&&< 17.10.117.10.1org.xwiki.platform:xwiki-platform-oldcore:17.10.1
☕Mavenorg.xwiki.platform:xwiki-platform-legacy-oldcore≥ 1.8-rc-1&&< 16.10.1616.10.16org.xwiki.platform:xwiki-platform-legacy-oldcore:16.10.16
☕Mavenorg.xwiki.platform:xwiki-platform-legacy-oldcore≥ 17.0.0-rc-1&&< 17.4.817.4.8org.xwiki.platform:xwiki-platform-legacy-oldcore:17.4.8
☕Mavenorg.xwiki.platform:xwiki-platform-legacy-oldcore≥ 17.5.0-rc-1&&< 17.10.117.10.1org.xwiki.platform:xwiki-platform-legacy-oldcore: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-oldcore, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.xwiki.platform:xwiki-platform-oldcore to 16.10.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-40104 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-2026-40104 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-40104. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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 17.1
O3 Security · Impact-Aware SCA

Is CVE-2026-40104 in your dependencies?

O3 Security finds CVE-2026-40104 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-2026-40104: xwiki-platform-oldcore DoS | O3 Security