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Grav CMS CVE-2026-56701

| EUVDEUVD-2026-38442 HIGH
Improper Restriction of XML External Entity Reference (CWE-611)
2026-06-23 VulnCheck GHSA-32fw-h446-j4hh
Information Disclosure XXE File Upload Grav
7.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
vuln.today AI
6.5 MEDIUM

Network-reachable admin upload (AV:N/AC:L), requires authenticated admin (PR:L), no UI; reads arbitrary files so C:H, but no write or DoS at base, so I:N/A:N.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jun 23, 2026 - 14:17 EUVD
Source Code Evidence Fetched
Jun 23, 2026 - 13:06 vuln.today
Analysis Generated
Jun 23, 2026 - 13:06 vuln.today

DescriptionCVE.org

Grav before 2.0.0-beta.2 contains an XML external entity injection vulnerability in SVG file upload processing that allows authenticated attackers to read arbitrary files. The application uses simplexml_load_string without disabling external entity loading, enabling attackers to inject XXE payloads via malicious SVG files to exfiltrate sensitive data.

AnalysisAI

Arbitrary file disclosure in Grav CMS versions prior to 2.0.0-beta.2 allows authenticated admin-panel users to read sensitive server files via XML External Entity (XXE) injection in SVG upload processing. The flaw stems from simplexml_load_string() being called without entity-loader protections, enabling exfiltration of credentials, configuration, and environment secrets. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain Grav admin credentials
Delivery
Log into admin panel
Exploit
Craft SVG with XXE SYSTEM entity
Install
Upload via Pages Media tab
C2
Server parses SVG with simplexml_load_string
Execute
Exfiltrate /etc/passwd and user/accounts YAML
Impact
Escalate using harvested secrets
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Vulnerability AssessmentAI

Exploitation Requires valid authenticated access to the Grav admin panel (CVSS PR:L) with permission to upload media via Pages → Media or the File Manager plugin, against a Grav installation older than 2.0.0-beta.2 where simplexml_load_string() processes SVG content without LIBXML_NONET or an entity-loading guard. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N) correctly characterizes the bug as network-reachable but requiring low-privilege authentication, with high confidentiality impact and no integrity or availability impact at the base level - a realistic 7.1. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained Grav admin credentials - through phishing, password reuse, or a separate vulnerability - logs into the admin panel, navigates to any page's Media tab, and uploads a crafted SVG containing a DOCTYPE declaration with a SYSTEM entity pointing at file:///srv/grav/user/accounts/admin.yaml. The server parses the SVG via simplexml_load_string(), inlines the file contents into the rendered/stored output, and the attacker harvests admin password hashes, 2FA seeds, and .env secrets to escalate to full host compromise. …
Remediation Vendor-released patch: upgrade Grav to 2.0.0-beta.2 or later, which corresponds to upstream commit 5a12f9be8314682c8713e569e330f11805d0a663 (https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663); see the GHSA advisory at https://github.com/getgrav/grav/security/advisories/GHSA-3446-6mgw-f79p for full details. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: disable SVG upload functionality or restrict uploads to authenticated users only; audit admin account access logs for suspicious activity. …

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-2026-56701 vulnerability details – vuln.today
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