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Grav Shortcode Core EUVDEUVD-2026-71022

| CVE-2026-85599 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-09-04 VulnCheck GHSA-5xgg-wmqq-qr2g
XSS Grav Getgrav
5.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
5.4 MEDIUM

PR:L for required page-edit auth; S:C and C:L/I:L because injected script executes in victim browsers cross-origin from the server context.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

2
Patch available
Sep 04, 2026 - 13:02 EUVD
Analysis Generated
Sep 04, 2026 - 12:22 vuln.today

DescriptionCVE.org

Grav Shortcode Core before 6.2.5 contains stored cross-site scripting vulnerabilities in the [lorem] tag parameter and [details] summary parameter that are written to rendered pages without escaping. Attackers with page-edit access can inject arbitrary HTML and JavaScript that executes in the browsers of all page visitors, including administrators.

AnalysisAI

Stored cross-site scripting in Grav Shortcode Core before 6.2.5 allows authenticated users with page-edit permissions to inject arbitrary HTML and JavaScript via the [lorem] tag parameter and [details] summary parameter, both of which are written to rendered pages without output escaping. Any visitor who loads an affected page - including site administrators - will have the injected script execute in their browser, enabling session hijacking, credential theft, or further privilege escalation against admin accounts. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid Grav account with page-edit (content-authoring) permissions - the CVSS 4.0 PR:L metric confirms low-privilege authenticated access is needed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:P) scores 5.1 (Medium), reflecting that exploitation requires low-privilege authenticated access (page-edit role) and passive user interaction (a victim must visit the page). … 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 Shortcode Core to version 6.2.5 or later, which escapes the [lorem] parameter and [details] summary attribute before rendering. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-71022 vulnerability details – vuln.today
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