GHSA-CWGQ-83W5-8JFQ

silverstripe/framework has possible denial of service attack vector when flushing

A possible denial of service attack vector has been identified in the dev/build system controller.

dev/build now has its own URL token, similar to flushtoken, to ensure users are authenticated when running dev/build outside of dev environments.

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.

GHSA-CWGQ-83W5-8JFQ has a CVSS score of 7.5 (High). The vector is network-reachable, no 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 (4.0.5, 4.1.3, 4.2.2); upgrading removes the vulnerable code path.

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1. What is GHSA-CWGQ-83W5-8JFQ? GHSA-CWGQ-83W5-8JFQ is a high-severity improper input validation vulnerability in silverstripe/framework (composer), affecting versions >= 4.0.0-rc1, < 4.0.5. It is fixed in 4.0.5, 4.1.3, 4.2.2. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
2. How severe is GHSA-CWGQ-83W5-8JFQ? GHSA-CWGQ-83W5-8JFQ has a CVSS score of 7.5 (High). 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.
3. Which versions of silverstripe/framework are affected by GHSA-CWGQ-83W5-8JFQ? silverstripe/framework (composer) versions >= 4.0.0-rc1, < 4.0.5 is affected.
4. Is there a fix for GHSA-CWGQ-83W5-8JFQ? Yes. GHSA-CWGQ-83W5-8JFQ is fixed in 4.0.5, 4.1.3, 4.2.2. Upgrade to this version or later.
5. Is GHSA-CWGQ-83W5-8JFQ exploitable, and should I be worried? Whether GHSA-CWGQ-83W5-8JFQ 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
6. What actually determines whether GHSA-CWGQ-83W5-8JFQ 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.
7. How do I fix GHSA-CWGQ-83W5-8JFQ?
   • Upgrade silverstripe/framework to 4.0.5 or later
   • Upgrade silverstripe/framework to 4.1.3 or later
   • Upgrade silverstripe/framework to 4.2.2 or later

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