Vulnerability Description
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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/getgrav/grav/security/advisories/GHSA-623v-m3c4-3pw8
- https://www.vulncheck.com/advisories/grav-flex-objects-server-side-template-inje
- https://github.com/getgrav/grav/security/advisories/GHSA-623v-m3c4-3pw8
FAQ
What is CVE-2026-58655?
CVE-2026-58655 is a vulnerability with a CVSS score of 8.8 (HIGH). 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,...
How severe is CVE-2026-58655?
CVE-2026-58655 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58655?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.