CVE-2025-66298 Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms

What is CVE-2025-66298?

CVE-2025-66298 is a high-severity code injection vulnerability in Getgrav Grav, published on 1 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Grav is a file-based Web platform. Prior to 1.8.0-beta.27, having a simple form on site can reveal the whole Grav configuration details (including plugin configuration details) by using the correct POST payload to exploit a Server-Side Template (SST) vulnerability. Sensitive information may be contained in the configuration details. This vulnerability is fixed in 1.8.0-beta.27.

Weakness: CWE-1336

Which versions are affected by CVE-2025-66298?

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

Products include Getgrav Grav.

How do I fix CVE-2025-66298?

Upgrade getgrav/grav to 1.8.0-beta.27 or later.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2025-66298 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66298 exists.

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
• How this page is made

Also known as GHSA-8535-hvm8-2hmv.