Summary
silverstripe/framework's URL parameters isDev and isTest unguarded
The URL parameters isDev and isTest are accessible to unauthenticated users who access a SilverStripe website or application. This allows unauthorised users to expose information that is usually hidden on production environments such as verbose errors (including backtraces) and other debugging tools only available to sites running in "dev mode". Core functionality does not expose user data through these methods. Depending on your website configuration, community modules might have added more specific functionality which can be used to either access or alter user data.
We have fixed the usage of isDev and isTest in SilverStripe 4.x, and removed the URL parameters in the next major release of SilverStripe.
Impact
GHSA-55QG-6C4M-MW6G has a CVSS score of 6.5 (Medium). The vector is network-reachable, low 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 (4.0.4, 4.1.1); 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.
Already deployed Kodem?
See it in your environmentNew to Kodem? Get a demo →Remediation advice
silverstripe/framework to 4.0.4 or later; silverstripe/framework to 4.1.1 or later
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is GHSA-55QG-6C4M-MW6G? GHSA-55QG-6C4M-MW6G is a medium-severity security vulnerability in silverstripe/framework (composer), affecting versions >= 4.0.0-rc1, < 4.0.4. It is fixed in 4.0.4, 4.1.1.
- How severe is GHSA-55QG-6C4M-MW6G? GHSA-55QG-6C4M-MW6G has a CVSS score of 6.5 (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 silverstripe/framework are affected by GHSA-55QG-6C4M-MW6G? silverstripe/framework (composer) versions >= 4.0.0-rc1, < 4.0.4 is affected.
- Is there a fix for GHSA-55QG-6C4M-MW6G? Yes. GHSA-55QG-6C4M-MW6G is fixed in 4.0.4, 4.1.1. Upgrade to this version or later.
- Is GHSA-55QG-6C4M-MW6G exploitable, and should I be worried? Whether GHSA-55QG-6C4M-MW6G 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 GHSA-55QG-6C4M-MW6G 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 GHSA-55QG-6C4M-MW6G?
- Upgrade
silverstripe/frameworkto 4.0.4 or later - Upgrade
silverstripe/frameworkto 4.1.1 or later
- Upgrade