Summary
Workarounds
We're not aware of any workaround, except denying access to the affected REST resources in a proxy in front of XWiki.
Impact
XWiki's REST API 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.
The application allocates resources such as memory, threads, or file descriptors based on untrusted input without enforcing a cap. Typical impact: resource exhaustion leading to denial of service.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
XWiki 17.7.0RC1, 17.4.4 and 16.10.11 introduce a configurable limit, limiting responses to 1000 items by default. Requesting larger limits leads to an error now.
Frequently Asked Questions
- What is CVE-2025-66473? CVE-2025-66473 is a high-severity allocation of resources without limits or throttling vulnerability in org.xwiki.platform:xwiki-platform-rest-server (maven), affecting versions < 16.10.11. It is fixed in 16.10.11, 17.4.4, 17.7.0-rc-1. The application allocates resources such as memory, threads, or file descriptors based on untrusted input without enforcing a cap.
- Which versions of org.xwiki.platform:xwiki-platform-rest-server are affected by CVE-2025-66473? org.xwiki.platform:xwiki-platform-rest-server (maven) versions < 16.10.11 is affected.
- Is there a fix for CVE-2025-66473? Yes. CVE-2025-66473 is fixed in 16.10.11, 17.4.4, 17.7.0-rc-1. Upgrade to this version or later.
- Is CVE-2025-66473 exploitable, and should I be worried? Whether CVE-2025-66473 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2025-66473 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2025-66473?
- Upgrade
org.xwiki.platform:xwiki-platform-rest-serverto 16.10.11 or later - Upgrade
org.xwiki.platform:xwiki-platform-rest-serverto 17.4.4 or later - Upgrade
org.xwiki.platform:xwiki-platform-rest-serverto 17.7.0-rc-1 or later
- Upgrade