CVE-2026-58655

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.

CVSS 4.0

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

1.4% chance of exploitation in the next 30 days; higher than 72% of CVEs (scores of 2026-10-25)

CWE

CWE-94

Published

2026-07-15

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

References

• https://github.com/getgrav/grav/security/advisories/GHSA-623v-m3c4-3pw8
• https://www.vulncheck.com/advisories/grav-flex-objects-server-side-template-injection-via-dynamic-titles
• https://github.com/getgrav/grav/security/advisories/GHSA-623v-m3c4-3pw8

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