getgrav Grav up to 1.3.x Flex Objects template_from_string Title special elements used in a template engine

Summaryinfo

A vulnerability described as critical has been identified in getgrav Grav up to 1.3.x. Impacted is the function template_from_string of the component Flex Objects. The manipulation of the argument Title results in improper neutralization of special elements used in a template engine. This vulnerability is known as CVE-2026-58655. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in getgrav Grav up to 1.3.x. It has been classified as critical. Affected is the function template_from_string of the component Flex Objects. The manipulation of the argument title with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. CWE is classifying the issue as CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The bundled Grav Flex Objects plugin (getgrav/grav-plugin-flex-objects) before 1.4.0 contains a stored server-side template injection vulnerability. When rendering dynamic collection or object titles, the plugin passes user-controlled frontmatter values (page.header.flex.collection.title or page.header.flex.object.title) to Twig's template_from_string(), causing them to be evaluated as Twig code rather than treated as text. This path bypasses Grav's Security::cleanDangerousTwig() sanitization. An attacker who can control the title frontmatter of a publicly reachable Flex Objects page can achieve arbitrary Twig execution and escalate to remote command execution via access to internal Grav services such as the scheduler.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-58655 since 07/01/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1221 by the MITRE ATT&CK project.

Upgrading to version 1.4.0 eliminates this vulnerability.

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Productinfo

Vendor

• getgrav

Name

• Grav

Version

• 1.0
• 1.1
• 1.2
• 1.3

Website

• Product: https://github.com/getgrav/grav/

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