Grav Server-side Template Injection via Insufficient Validation in filterFilter
CVE-2023-34252
8.8HIGH
What is CVE-2023-34252?
Grav CMS, a popular flat-file content management system, contains a flaw in the GravExtension.filterFilter() function prior to version 1.7.42. This flaw allows validation against a list of unsafe functions to be bypassed when an array is passed as an argument instead of a string. Consequently, a low-privileged attacker with access to the Grav Admin panel can exploit this issue to inject malicious templates, potentially leading to remote code execution. Users should update to version 1.7.42 or later and secure their configuration files by setting the twig.undefined_functions and twig.undefined_filters properties to false.
Affected Version(s)
grav < 1.7.42
References
CVSS V3.1
Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged
Timeline
Vulnerability published
Vulnerability Reserved