CVE-2026-58655
Stored server-side template injection in Grav Flex Objects plugin allows Twig code execution.
Is CVE-2026-58655 being exploited?
Not confirmed. CVE-2026-58655 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 1.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-58655?
CVE-2026-58655 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58655?
Yes. A fix has been recorded for CVE-2026-58655. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58655 affect?
CVE-2026-58655 affects getgrav/grav-plugin-flex-objects < 1.4.0, Grav CMS sites using Flex Objects with publicly editable frontmatter. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58655?
Upgrade to grav-plugin-flex-objects >=1.4.0 or disable the Flex Objects plugin
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker-controlled frontmatter leads to arbitrary Twig execution and potential RCE via Grav internal services (e.g., scheduler).
Immediate action required
- affected< 1.4.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.