Summary
References
https://owasp.org/www-project-top-ten/2017/A7_2017-Cross-Site_Scripting_(XSS)
https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html
https://cwe.mitre.org/data/definitions/79.html
For more information
Please contact [email protected]
Impact
Privileged users (with the ability to edit pages) have a mechanism to perform remote code execution via XSS. At a minimum, the vulnerability represents a bypass of security controls put in place to mitigate this form of attack.
The remote code execution can be performed because XSS would allow an attacker to execute functionality on behalf of a stolen administrative account - the facility to install custom plugins would then allow said attacker to install a plugin containing a web shell and thus garner access to the underlying system.
Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.
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
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is GHSA-CVMR-6428-87W9? GHSA-CVMR-6428-87W9 is a medium-severity cross-site scripting (XSS) vulnerability in getgrav/grav (composer), affecting versions < 1.6.30. It is fixed in 1.6.30. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
- Which versions of getgrav/grav are affected by GHSA-CVMR-6428-87W9? getgrav/grav (composer) versions < 1.6.30 is affected.
- Is there a fix for GHSA-CVMR-6428-87W9? Yes. GHSA-CVMR-6428-87W9 is fixed in 1.6.30. Upgrade to this version or later.
- Is GHSA-CVMR-6428-87W9 exploitable, and should I be worried? Whether GHSA-CVMR-6428-87W9 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-CVMR-6428-87W9 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-CVMR-6428-87W9? Upgrade
getgrav/gravto 1.6.30 or later.