TI-2023-17274 Aliases CVE-2023-34448 GHSA-whr7-m3f8-mpm8

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

HIGH 73CWE-1336Published 2023-06-14 · Updated 2024-12-18

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1336.

Summary

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, did 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`.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.04515 91st percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix Fixed grav (getgrav): 1.7.42getgrav/grav (Packagist): 1.7.42

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
getgrav	grav	before 1.7.42	1.7.42	Patch available	CNA
—	getgrav/grav (Packagist)	before 1.7.42	1.7.42	Patch available	GHSA-whr7-m3f8-mpm8

grav Vendorgetgrav Affected before 1.7.42 Fixed in 1.7.42 Patch available CNA
getgrav/grav (Packagist) Vendor— Affected before 1.7.42 Fixed in 1.7.42 Patch available GHSA-whr7-m3f8-mpm8

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:getgrav:grav::::::::	before 1.7.42	Vulnerable	getgrav

cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:* Versions before 1.7.42 Vulnerable ·getgrav

Remediation

Fix · CNA grav (getgrav) Fixed in 1.7.42
Fix · GHSA-whr7-m3f8-mpm8 getgrav/grav (Packagist) Fixed in 1.7.42 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2023-34448
2026-10-03 Alias added: GHSA-whr7-m3f8-mpm8

References

Exploit 2

Patch 1

https://github.com/getgrav/grav/commit/8c2c1cb72611a399f13423fc6d0e1d998c03e5c8

Advisory 3

Other 5

TI-2025-28971 Cross Site Scripting vulnerability in grav v.1.7.48 and before allows an attacker to… CVSS 3.1CRITICAL 9.8
TI-2021-22428 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) CVSS 4.0CRITICAL 9.3
TI-2025-41064 In grav <1.7.49.5, a SSRF (Server-Side Request Forgery) vector may be triggered via Twig… CVSS 3.1CRITICAL 9.1
TI-2026-30888 Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component. CVSS 4.0HIGH 8.8
TI-2025-40773 Security Sandbox Bypass with SSTI (Server Side Template Injection) in the Grav CMS CVSS 3.1HIGH 8.8
TI-2025-40768 Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass CVSS 4.0HIGH 8.7

See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences