Summary
API Platform Core does not call GraphQl securityAfterResolver
A security check that gets called after GraphQl resolvers is always replaced by another one as there's no break in this clause: https://github.com/api-platform/core/pull/6444/files#diff-09e3c2cfe12a2ce65bd6c983c7ca6bfcf783f852b8d0554bb938e8ebf5e5fa65R56
PoC
Create a graphql endpoint with a security after resolver.
Impact
As this fallsback to security, the impact is there only when there's only a security after resolver and none inside security. The test at https://github.com/api-platform/core/pull/6444 is probably broken.
The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.
CVE-2025-23204 has a CVSS score of 4.4 (Medium). The vector is network-reachable, high privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (3.3.15); upgrading removes the vulnerable code path.
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.
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Frequently Asked Questions
- What is CVE-2025-23204? CVE-2025-23204 is a medium-severity improper input validation vulnerability in api-platform/core (composer), affecting versions >= 3.3.8, < 3.3.15. It is fixed in 3.3.15. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
- How severe is CVE-2025-23204? CVE-2025-23204 has a CVSS score of 4.4 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of api-platform/core are affected by CVE-2025-23204? api-platform/core (composer) versions >= 3.3.8, < 3.3.15 is affected.
- Is there a fix for CVE-2025-23204? Yes. CVE-2025-23204 is fixed in 3.3.15. Upgrade to this version or later.
- Is CVE-2025-23204 exploitable, and should I be worried? Whether CVE-2025-23204 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-2025-23204 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-2025-23204? Upgrade
api-platform/coreto 3.3.15 or later.