What’s Vulnerable › Vulnerabilities

CVE-2025-66473: XWiki's REST APIs don't enforce any limits, leading to unavailability and OOM in large wikis

• Severity: high (CVSS 7.5 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: 2025-12-10 · updated 2026-09-25
• Weakness: CWE-770

Description

XWiki is an open-source wiki software platform. Versions 16.10.10 and below, 17.0.0-rc-1 through 17.4.3 and 17.5.0-rc-1 through 17.6.0 contain a REST API which doesn't enforce any limits for the number of items that can be requested in a single request at the moment. Depending on the number of pages in the wiki and the memory configuration, this can lead to slowness and unavailability of the wiki. As an example, the /rest/wikis/xwiki/spaces resource returns all spaces on the wiki by default, which are basically all pages. This issue is fixed in versions 17.4.4 and 16.10.11.

Affected products

• xwiki-platform: before 16.10.11; from 17.0.0 before 17.4.4; from 17.5.0 through 17.6.0 — fixed in 16.10.11, 17.4.4

How to fix

Upgrade to a fixed version: xwiki-platform 16.10.11, 17.4.4. Check the vendor advisory for mitigations.

References

• https://github.com/xwiki/xwiki-platform/commit/e3c47745195fb445b054537be86f5c01ee69558b
• https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-cc84-q3v3-mhgf
• https://jira.xwiki.org/browse/XWIKI-23355
• https://jira.xwiki.org/browse/XWIKI-23355

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