grav up to 1.8.0-beta.27 Twig code injection

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in grav up to 1.8.0-beta.27. Affected is an unknown function of the component Twig Handler. Such manipulation leads to code injection. This vulnerability is documented as CVE-2025-66299. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in grav up to 1.8.0-beta.27. It has been rated as critical. Affected by this issue is an unknown code block of the component Twig Handler. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Grav is a file-based Web platform. Prior to 1.8.0-beta.27, Grav CMS is vulnerable to a Server-Side Template Injection (SSTI) that allows any authenticated user with editor permissions to execute arbitrary code on the remote server, bypassing the existing security sandbox. Since the security sandbox does not fully protect the Twig object, it is possible to interact with it (e.g., call methods, read/write attributes) through maliciously crafted Twig template directives injected into a web page. This allows an authenticated editor to add arbitrary functions to the Twig attribute system.twig.safe_filters, effectively bypassing the Grav CMS sandbox. This vulnerability is fixed in 1.8.0-beta.27.

The advisory is available at github.com. This vulnerability is handled as CVE-2025-66299 since 11/27/2025. The exploitation is known to be easy. The attack may be launched remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 1.8.0-beta.27 eliminates this vulnerability. Applying the patch e37259527d9c1deb6200f8967197a9fa587c6458 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Code injection
CWE: CWE-94 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: grav 1.8.0-beta.27
Patch: e37259527d9c1deb6200f8967197a9fa587c6458

Timelineinfo

11/27/2025 CVE reserved
12/01/2025 +4 days Advisory disclosed
12/01/2025 +0 days VulDB entry created
12/01/2025 +0 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-gjc5-8cfh-653x
Status: Confirmed

CVE: CVE-2025-66299 (🔒)
GCVE (CVE): GCVE-0-2025-66299
GCVE (VulDB): GCVE-100-333926

Entryinfo

Created: 12/01/2025 23:29
Changes: 12/01/2025 23:29 (66)
Complete: 🔍
Cache ID: 216::103

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