How severe is GHSA-cvmr-6428-87w9?

No CVSS score has been assigned to GHSA-cvmr-6428-87w9 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-cvmr-6428-87w9?

GHSA-cvmr-6428-87w9 affects the following packages: getgrav/grav (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-cvmr-6428-87w9?

Update getgrav/grav to 1.6.30 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cvmr-6428-87w9 is resolved across your whole dependency graph.

How do I detect GHSA-cvmr-6428-87w9 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for getgrav/grav. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-cvmr-6428-87w9 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-cvmr-6428-87w9?

O3 pinpoints whether GHSA-cvmr-6428-87w9 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-cvmr-6428-87w9 actively exploited in the wild?

No public exploit code has been indexed for GHSA-cvmr-6428-87w9 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What type of vulnerability is GHSA-cvmr-6428-87w9?

GHSA-cvmr-6428-87w9 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-cvmr-6428-87w9 published, and has it been updated?

GHSA-cvmr-6428-87w9 was published on December 10, 2020 and was last updated on July 8, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

Not in CISA KEV

GHSA-cvmr-6428-87w9

GHSA-cvmr-6428-87w9 is a Cross-site Scripting (XSS) vulnerability in getgrav/grav. O3 Security confirms whether GHSA-cvmr-6428-87w9 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Cross-Site Scripting in Grav

Also known asCVE-2020-37256

Published

Dec 10, 2020

Updated

Jul 8, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Jul 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐘getgrav/grav

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

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]

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`getgrav/grav`	all versions	1.6.30

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for getgrav/grav. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update getgrav/grav to 1.6.30 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cvmr-6428-87w9 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-cvmr-6428-87w9 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-cvmr-6428-87w9. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### 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. ### References https://owasp.org/www-project-t

O3 Security · Impact-Aware SCA

Is GHSA-cvmr-6428-87w9 in your dependencies?

O3 detects GHSA-cvmr-6428-87w9 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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