EUVD-2026-71027
GHSA-ggph-mfjj-69jr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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
Requires low-privilege authenticated access (page-write role); RCE as web server user crosses into OS scope, yielding full C/I/A impact and a scope change.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
Grav before 2.0.19 (affected versions <= 2.0.17) contains a remote code execution vulnerability in the Twig sort filter. The sortFunc wrapper in GravExtension.php hardcodes Twig's isSandboxed argument to false, so unlike |map/|filter/|reduce, |sort accepts a plain function name inside the sandbox; the remaining denylist misses spl_autoload, which performs a PHP include. An authenticated user with only page-write rights (admin.pages or api.pages.write) can supply a crafted payload (e.g., via form frontmatter rendered by the Email plugin) that invokes spl_autoload through the sort filter, resulting in arbitrary PHP execution as the web server user.
AnalysisAI
Remote code execution in Grav CMS (versions ≤2.0.17) lets authenticated users holding only page-write rights achieve arbitrary PHP execution on the web server by exploiting a Twig sandbox bypass in the |sort filter. The sortFunc wrapper in GravExtension.php incorrectly hardcodes isSandboxed=false-unlike |map, |filter, and |reduce-allowing |sort to resolve plain PHP callable names including spl_autoload, which is absent from the function denylist and performs a PHP include operation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated session with the admin.pages or api.pages.write permission on the target Grav instance-these are the roles assigned to content editors who can create or modify pages. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector supplied in the input (PR:N/UI:N/VC:H/VI:N/VA:N) materially misrepresents the exploitation requirements: the description is unambiguous that a valid authenticated account with page-write permissions (admin.pages or api.pages.write) is mandatory, and the impact is full RCE-not confidentiality-only. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Grav to version 2.0.19 or later; this release corrects the isSandboxed argument in sortFunc and closes the spl_autoload denylist gap. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Grav CMS instances across your infrastructure and determine which are running version 2.0.17 or earlier. …
Sign in for detailed remediation steps and compensating controls.
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External POC / Exploit Code
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