Grav is a flat-file content management system. Prior to version 1.7.42, there is a logic flaw in the `GravExtension.filterFilter()` function whereby validation against a denylist of unsafe functions is only performed when the argument passed to filter is a string. However, passing an array as a callable argument allows the validation check to be skipped. Consequently, a low privileged attacker with login access to Grav Admin panel and page creation/update permissions is able to inject malicious templates to obtain remote code execution. The vulnerability can be found in the `GravExtension.filterFilter()` function declared in `/system/src/Grav/Common/Twig/Extension/GravExtension.php`. Version 1.7.42 contains a patch for this issue. End users should also ensure that `twig.undefined_functions` and `twig.undefined_filters` properties in `/path/to/webroot/system/config/system.yaml` configuration file are set to `false` to disallow Twig from treating undefined filters/functions as PHP functions and executing them.
CVSS Score
8.8
EPSS Score
0.005
Published
2023-06-14
Code Injection in GitHub repository getgrav/grav prior to 1.7.34.
CVSS Score
9.1
EPSS Score
0.002
Published
2022-06-29
stored xss in GitHub repository getgrav/grav prior to 1.7.33.
CVSS Score
8.2
EPSS Score
0.004
Published
2022-04-26
Cross-site Scripting (XSS) - Stored in GitHub repository getgrav/grav prior to 1.7.31.
CVSS Score
7.1
EPSS Score
0.004
Published
2022-03-15
Cross-site Scripting (XSS) - Stored in GitHub repository getgrav/grav prior to 1.7.31.
CVSS Score
4.6
EPSS Score
0.003
Published
2022-02-28
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