CVE-2020-37256 Grav - Cross-Site Scripting in Admin Plugin Page Editor

What is CVE-2020-37256?

CVE-2020-37256 is a medium-severity cross-site scripting vulnerability in Getgrav Grav, published on 25 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Grav before 1.6.30 contains a cross-site scripting vulnerability in the Admin plugin page editor default security configuration. Privileged users with page editing capabilities can inject malicious scripts to execute arbitrary code and install malicious plugins for system access.

Weakness: CWE-79

Which versions are affected by CVE-2020-37256?

2 open source packages ship an affected version, including getgrav/grav. It affects 1 product.

Products include Getgrav Grav.

How do I fix CVE-2020-37256?

Upgrade getgrav/grav to 1.6.30 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2020-37256 being exploited?

There is no known exploitation of CVE-2020-37256 in the wild and no public exploit code.

Other vulnerabilities in Getgrav Grav

• CVE-2023-34251 Grav Server Side Template Injection vulnerability Critical 10.0
• CVE-2025-46199 Cross-site scripting in n/a Critical 9.8
• CVE-2021-47812 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) Critical 9.3
• CVE-2025-66844 Grav may be vulnerable to SSRF attack via Twig Templates Critical 9.1
• CVE-2022-2073 Code Injection in getgrav/grav Critical 9.1

All Getgrav Grav vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-cvmr-6428-87w9, GHSA-gwrh-r2g6-7wgp.