EUVD-2026-40452
GHSA-58cg-x8gx-6hg3
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable but the dominant credible paths need attacker-controlled serialized input plus a gadget chain (AC:H) or authenticated access (PR:L); successful exploitation yields full RCE, so C/I/A High.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
Grav CMS before 2.0.0-beta.2 contains multiple code-execution vulnerabilities. Three unsafe unserialize() calls - in Scheduler\JobQueue, Framework\Cache\Adapter\FileCache, 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.
Articles & Coverage 1
AnalysisAI
Arbitrary code execution in Grav CMS before 2.0.0-beta.2 stems from three distinct flaw classes: PHP object injection via unsafe unserialize() of attacker-controllable data in the Scheduler JobQueue, FileCache adapter, and Session components, an OS command injection in the plugin/theme InstallCommand git clone routine, and a Twig sandbox blocklist bypass enabling server-side template injection. An attacker who can influence the serialized input can chain available gadgets to run arbitrary PHP, while the command-injection path is reachable by authenticated administrators through plugin/theme installation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The OS command-injection path requires authenticated administrator access to the plugin/theme installation feature and exploits unescaped branch, url, and path parameters passed into the git clone shell command - admin privilege is the explicit limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H, score 9.3) represents the worst-case blended rating across the three flaw classes and implies remote, unauthenticated, full-impact code execution, but the individual vectors differ in real prerequisites and that nuance matters for prioritization. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can place or influence serialized data consumed by Grav's Session or FileCache supplies a crafted PHP object payload; when Grav calls unserialize() without class restrictions, a magic-method gadget chain executes and yields arbitrary PHP code on the server. Alternatively, a malicious or compromised administrator installs a plugin/theme whose branch, url, or path field contains shell metacharacters, causing the unescaped git clone command to execute attacker-chosen OS commands. … |
| Remediation | Upgrade to the fixed release - Vendor-released patch: 2.0.0-beta.2 - which addresses all three flaw classes; this is the primary and recommended remediation, documented in the vendor advisory GHSA-vj3m-2g9h-vm4p (https://github.com/getgrav/grav/security/advisories/GHSA-vj3m-2g9h-vm4p). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all Grav CMS deployments to identify versions and document current patch levels; prioritize internet-facing instances and those with database access. …
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External POC / Exploit Code
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