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CVE-2026-65008 – Remote Code Execution – Grav CMS versions prior to 2.0.7

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Summary

CVE-2026-65008 is a critical (CVSS 3.1: 9.8 / CVSS 4.0: 9.3) remote code execution vulnerability in Grav CMS affecting all versions prior to 2.0.7. The flaw resides in Blueprint::dynamicData(), which passes a Class::method callable string and its arguments directly to PHP’s call_user_func_array() without any allowlist — enabling a two-stage attack where a low-privileged authenticated user plants a malicious payload that subsequently fires for every unauthenticated visitor who loads the affected page. A patch is available in Grav 2.0.7, released on July 21, 2026.

Technical details

  • Root cause: Blueprint::dynamicData() in system/src/Grav/Common/Data/Blueprint.php invokes call_user_func_array() on an attacker-supplied Class::method callable string and its arguments with no allowlist or sanitization (CWE-94: Improper Control of Generation of Code).
  • Stage 1 — Payload planting (authenticated): An account holding the admin.pages or api.pages.write permission embeds a malicious callable directive inside a page’s YAML frontmatter via the Grav form plugin.
  • Stage 2 — Trigger (unauthenticated): Once the directive is stored, it executes as the web-server user automatically whenever any visitor — including completely unauthenticated internet users — loads the affected page over HTTP/HTTPS.
  • Attack vector: Fully network-accessible; no special network position or client interaction is required to trigger execution after the payload is planted.
  • Impact: Full remote code execution as the web-server process user, resulting in complete compromise of confidentiality, integrity, and availability of the affected host.
  • No public proof-of-concept was identified at time of publication (CVE published 2026-07-21); however, the underlying mechanism (unrestricted call_user_func_array via frontmatter) is well-documented within the PHP ecosystem and consistent with prior Grav exploit patterns.

Affected software

  • Grav CMS — all versions prior to 2.0.7

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • CVSS v3.1 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 base score: 9.3 (Critical)
  • CVSS v4.0 vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade Grav CMS to version 2.0.7 or later. The 2.0.7 release includes a hardened Blueprint::dynamicData() implementation that refuses dangerous callable directives in dynamic field data.
  • If immediate patching is not possible:
    • Restrict or disable write access to page frontmatter for all accounts holding admin.pages or api.pages.write permissions until an upgrade can be applied.
    • Audit existing pages for unexpected callable directives in YAML frontmatter.
    • Apply network-level controls (WAF rules, IP allowlisting) on Grav admin endpoints to limit exposure of the page-editing interface.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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