Grav Server-side Template Injection (SSTI) via Twig Default Filters

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.2 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2023-34448: 4.52% estimated exploitation activity in the next 30 days; percentile 91.54 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Hi, actually we have sent the bug report to security@getgrav.org on 27th March 2023 and on 10th April 2023. Grav Server-side Template Injection (SSTI) via Twig Default Filters 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 (Commit 685d762) (Latest version as of writing) | | Tested Versions | v1.7.40 | | Internal Identifier | STAR-2023-0008 | | CVE Identifier | TBD | | CWE(s) | CWE-184: Incomplete List of Disallowed Inputs, 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 | | Attack Complexity…

Published by the source

16 Jun 2023, 19:37 UTC

Last modified by the source

5 Nov 2023, 05:03 UTC

Source last checked

26 Oct 2026, 14:10 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-whr7-m3f8-mpm8

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2023-34448

Advisory: Grav Server-side Template Injection (SSTI) via Twig Default Filters
IDs: CVE-2023-34448, GHSA-whr7-m3f8-mpm8
Record: https://patchnext.com/advisories/cve-2023-34448 (revision 1, source checked 26 Oct 2026, 14:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: getgrav/grav 1.7.42. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist getgrav/grav: affected < 1.7.42; fixed in 1.7.42

## Suggested inspection (read-only)
- Packagist getgrav/grav: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on getgrav/grav.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-whr7-m3f8-mpm8 (GitHub-reviewed advisory GHSA-whr7-m3f8-mpm8 lists affected ranges: Packagist getgrav/grav >=0 <1.7.42)

Commands are suggestions: review each one before running it.