PT-2026-54048 · Grav · Grav

Proscan-One · Published 2026-06-30 · Updated 2026-06-30 · CVE-2026-56700

Mitre

CVSS v3.1

9.8

Critical

Base vector

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

Grav CMS before 2.0.0-beta.2 contains multiple code-execution vulnerabilities. Three unsafe unserialize() calls - in SchedulerJobQueue, FrameworkCacheAdapterFileCache, and Session - deserialize untrusted data without restricting allowed classes, enabling PHP object injection and, via a gadget chain, arbitrary code execution where an attacker controls the serialized input. Additionally, InstallCommand's git clone operation passes the branch, url, and path parameters into a shell command without escaping, allowing OS command injection via plugin/theme installation (which requires admin access). A Twig security blocklist bypass (server-side template injection) is also present. The issues are fixed in 2.0.0-beta.2.

Fix

OS Command Injection

Deserialization of Untrusted Data

Weakness Enumeration

CWE-78

CWE-502

Related Identifiers

CVE-2026-56700

Affected Products

Grav

References · 3

• https://github.com/getgrav/grav/security/advisories/GHSA-vj3m-2g9h-vm4p · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-56700 · Security Note
• https://vulncheck.com/advisories/grav-multiple-remote-code-execution-vulnerabilities-via-unsafe-unserialize-and-command-injection · Note