Is CVE-2026-58655 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58655 being exploited in the wild.

How severe is CVE-2026-58655?

High severity, with a CVSS score of 8.8, published 15 July 2026.

Is there a fix for CVE-2026-58655?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-58655 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-58655?

Check whether you run Grav Flex Objects at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-58655: Grav Flex Objects server-side template injection in dynamic titles

CVE-2026-58655 · Severity: high · CVSS 8.8 · Published 2026-07-15

The Grav Flex Objects plugin, a component used for managing complex data types in the Grav content management system, contains a security flaw in how it handles page titles. An attacker with the ability to edit page settings can inject malicious code that the server executes automatically. This could allow an attacker to steal sensitive data, modify website content, or take full control of the underlying web server.

Technologies: Grav Flex Objects. Vendors: Grav.

Quick answers

Is CVE-2026-58655 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58655 being exploited in the wild.
How severe is CVE-2026-58655?: High severity, with a CVSS score of 8.8, published 15 July 2026.
Which products and versions are affected?: Grav Flex Objects < 1.4.0.
Is there a fix for CVE-2026-58655?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-58655 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-58655?: Check whether you run Grav Flex Objects at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stored server-side template injection (SSTI) vulnerability exists in the Grav Flex Objects plugin due to the unsafe use of Twig's 'template_from_string()' function. When rendering dynamic titles, the plugin processes user-controlled frontmatter values (specifically 'page.header.flex.collection.title' or 'page.header.flex.object.title') as Twig templates instead of literal text. This execution path bypasses the standard 'Security::cleanDangerousTwig()' sanitization mechanism. An authenticated attacker with low privileges (sufficient to modify page frontmatter) can achieve arbitrary Twig execution. This can be further escalated to remote code execution (RCE) by accessing the global 'grav' object and utilizing internal services like the scheduler to execute system commands. The issue is fixed in version 1.4.0.

Affected products

getgrav Grav Flex Objects plugin < 1.4.0

Timeline

2026-06-22: advisory: Vendor advisory published on GitHub
2026-07-15: disclosed: NVD publication date

References

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