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EUVD-2026-207404

2026-10-10T20:53:38.681448+00:00

EUVD-2026-207404

fkie_cve-2023-34252

2026-10-10T20:53:38.681479+00:00

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.

GHSA-96xv-rmwj-6p9w — Grav Server-side Template Injection (SSTI) via Twig Default Filters

2026-10-10T20:53:38.681515+00:00

Affected: Packagist: getgrav/grav

Hi,

actually we have sent the bug report to [security@getgrav.org](mailto:security@getgrav.org) on 27th March 2023 and on 10th April 2023.

# Grav Server-side Template Injection (SSTI) via Insufficient Validation in filterFilter

## Summary: | **Product** | Grav CMS | | ----------------------- | --------------------------------------------- | | **Vendor** | Grav | | **Severity** | High - Users with login access to Grav Admin panel and page creation/update permissions are able to obtain remote code/command execution | | **Affected Versions** | <= [v1.7.40](https://github.com/getgrav/grav/tree/1.7.40) (Commit [685d762](https://github.com/getgrav/grav/commit/685d76231a057416651ed192a6a2e83720800e61)) (Latest version as of writing) | | **Tested Versions** | v1.7.40 | | **Internal Identifier** | STAR-2023-0007 | | **CVE Identifier** | TBD | | **CWE(s)** | CWE-20: Improper Input Validation, CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine |

## CVSS3.1 Scoring System: **Base Score:** 7.2 (High) **Vector String:** `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H` | **Metric** | **Value** | | ---------------------------- | --------- | | **Attack Vector (AV)** | Network | | **A…

gsd-2023-34252

2026-10-10T20:53:38.681599+00:00

gsd-2023-34252