Package Instance

Server Side Template Injection (SSTI)
Grav validates accessible functions through the Utils::isDangerousFunction function, but does not impose restrictions on twig functions like twig_array_map, allowing attackers to bypass the validation and execute arbitrary commands.

Code injection in grav
Grav is vulnerable to Server Side Template Injection via Twig. According to a previous vulnerability report, Twig should not render dangerous functions by default, such as system.

Server Side Template Injection (SSTI) via Twig escape handler
Due to the unrestricted access to twig extension class from grav context, an attacker can redefine the escape function and execute arbitrary commands.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Cross-site Scripting (XSS) - Stored in Packagist getgrav/grav prior to 1.7.28.

Improper Control of Generation of Code ('Code Injection')
Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance. The issue was addressed in version 1.7.11.

Server Side Template Injection (SSTI)
Due to the unrestricted access to twig extension class from grav context, an attacker can redefine config variable. As a result, attacker can bypass previous patch.

Grav Vulnerable to Arbitrary File Read to Account Takeover
A low privilege user account with page edit privilege can read any server files using Twig Syntax. This includes Grav user account files - /grav/user/accounts/*.yaml. This file stores hashed user password, 2FA secret, and the password reset token. This can allow an adversary to compromise any registered account by resetting a password for a user to get access to the password reset token from the file or by cracking the hashed password.

Remote Code Execution by uploading a phar file using frontmatter
- Due to insufficient permission verification, user who can write a page use frontmatter feature.
- Inadequate File Name Validation

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
A cross-site scripting (XSS) vulnerability in Grav versions 1.7.44 and before, allows remote authenticated attackers to execute arbitrary web scripts or HTML via the onmouseover attribute of an ISINDEX element.

Cross-Site Request Forgery (CSRF)
The Scheduler in Grav CMS allows an attacker to execute a system command by tricking an admin into visiting a malicious website (CSRF).

Grav Cross-site Scripting vulnerability
A cross-site scripting (XSS) vulnerability in Grav v1.7.45 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

Improper Control of Generation of Code ('Code Injection')
Grav is a flat-file content management system. Prior to version 1.7.42, the patch for CVE-2022-2073, a server-side template injection vulnerability in Grav leveraging the default `filter()` function, does not block other built-in functions exposed by Twig's Core Extension that could be used to invoke arbitrary unsafe functions, thereby allowing for remote code execution. A patch in version 1.74.2 overrides the built-in Twig `map()` and `reduce()` filter functions in `system/src/Grav/Common/Twig/Extension/GravExtension.php` to validate the argument passed to the filter in `$arrow`.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Cross-site Scripting (XSS) - Stored in GitHub repository getgrav/grav prior to 1.7.31.

Improper Control of Generation of Code ('Code Injection')
Grav is a flat-file content management system. Versions prior to 1.7.42 is vulnerable to server side template injection. Remote code execution is possible by embedding malicious PHP code on the administrator screen by a user with page editing privileges. Version 1.7.42 contains a fix for this issue.