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Grav CMS CVE-2026-75827

| EUVDEUVD-2026-60591 CRITICAL
Code Injection (CWE-94)
2026-08-18 VulnCheck GHSA-fwwx-3362-3947
PHP Code Injection RCE Grav
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
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
vuln.today AI
8.8 HIGH

Description requires page-edit or blueprint-config access, so PR:L not PR:N; network-reachable admin, low complexity, and file-write-to-RCE yields full C/I/A impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 18, 2026 - 12:02 EUVD
Analysis Generated
Aug 18, 2026 - 11:48 vuln.today
CVE Published
Aug 18, 2026 - 11:19 cve.org
CRITICAL 9.3

DescriptionCVE.org

Grav before 2.0.15 contains an arbitrary file write vulnerability in the Blueprint dynamic-data bare-function validation that uses an incomplete denylist instead of a positive allowlist. Attackers with page-edit or blueprint-config access can invoke the error_log function through a data directive to append PHP payloads to web-accessible files, achieving remote code execution.

Articles & Coverage 1

News Critical RCE in Grav CMS before 2.0.15 - CVE-2026-75827 Aug 18, 2026

AnalysisAI

Remote code execution in Grav CMS before 2.0.15 allows attackers holding page-edit or blueprint-config privileges to write arbitrary PHP into web-accessible files and execute it. The flaw lives in the Blueprint dynamic-data 'bare-function' validation, which relies on an incomplete denylist rather than a positive allowlist, letting the error_log function be invoked through a data directive to append attacker-controlled PHP payloads. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with page-edit or blueprint-config access
Delivery
Craft Blueprint data directive calling error_log
Exploit
Bypass incomplete denylist validation
Execution
Append PHP payload to web-accessible file
Persist
Request file to execute code
Impact
Achieve remote code execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to already possess page-edit or blueprint-config access in Grav, and the target install must be running a version before 2.0.15 where the bare-function validation uses the incomplete denylist. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 4.0 vector (9.3, AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H) scores this as critical and unauthenticated, but this directly conflicts with the description, which states the attacker must already have page-edit or blueprint-config access - i.e. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A user with a content-editor account (or access to blueprint configuration) crafts a Blueprint data directive that invokes the error_log function, passing a PHP payload and targeting a web-accessible file path. Grav's incomplete denylist permits the call, appending the PHP code to the file; the attacker then requests that file through the web server to execute their code and obtain RCE. …
Remediation Vendor-released patch: upgrade to Grav 2.0.15 or later, which replaces the incomplete bare-function denylist with proper validation; see GHSA-f8wv-xp27-6gq7 (https://github.com/getgrav/grav/security/advisories/GHSA-f8wv-xp27-6gq7). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: inventory all Grav CMS deployments, identify instances running versions prior to 2.0.15, and audit accounts with page-edit or blueprint-config privileges. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-75827 vulnerability details – vuln.today
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