EUVD-2026-71021
GHSA-xm9c-rv38-f24j
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
Editor credentials required (PR:L), victim must visit page (UI:R), scope changes to victim browser affecting session confidentiality and integrity (S:C/C:L/I:L).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
1DescriptionCVE.org
Grav versions 2.0.0 through 2.0.17 fail to apply save-time XSS detection to modular pages, allowing authenticated page editors to store Twig-assembled XSS payloads. Attackers with page-edit rights can create modular pages with malicious Twig code that executes in visitor browsers when the parent page is rendered, including in administrator sessions.
AnalysisAI
Stored cross-site scripting in Grav CMS versions 2.0.0 through 2.0.17 allows authenticated page editors to plant persistent XSS payloads via the modular page subsystem, which bypasses the CMS's save-time XSS sanitization entirely. By embedding malicious Twig template code into a modular page, an attacker with page-edit privileges can cause arbitrary JavaScript to execute in the browsers of any visitor to the parent page - including site administrators. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) an attacker account with page-edit (editor-level) privileges on the target Grav installation - unauthenticated exploitation is not possible; (2) Grav CMS version between 2.0.0 and 2.0.17 inclusive; (3) the modular page feature must be in use (it is a standard Grav feature, not a non-default plugin); (4) a victim - including any administrator - must passively visit the parent page that renders the malicious modular child. … 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) accurately reflects the constrained impact: exploitation requires authenticated access with page-edit rights (PR:L) and passive user interaction from a victim (UI:P), and direct system impact is nil (VC:N/VI:N/VA:N). … 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 | Upstream fix availability should be confirmed by consulting the GitHub Security Advisory at https://github.com/getgrav/grav/security/advisories/GHSA-fg8g-663r-f366; no specific patched version number was provided in the available source data, so administrators should check that advisory directly for the minimum safe version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a Server-Side Template Injection (SSTI) vulnerability exists
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, due to improper authorization checks when modifying critical
A Remote Code Execution (RCE) vulnerability in Grav CMS v1.7.48 allows an authenticated admin to upload a malicious plug
Grav is a file-based Web platform. Rated critical severity (CVSS 9.9), this vulnerability is remotely exploitable, low a
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)
View allShare
External POC / Exploit Code
Leaving vuln.today