CVE-2026-46395

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{"affected": [{"affectedData": [{"product": "haxcms-nodejs", "vendor": "haxtheweb", "versions": [{"status": "affected", "version": "< 26.0.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0, the `hmacBase64()` function in the HAXcms Node.js backend contains two critical cryptographic implementation errors that together allow any unauthenticated attacker to extract the system\u2019s private signing key and forge arbitrary admin-level JSON Web Tokens (JWTs) allowing them to get full admin access with a single HTTP request. First, the function passes the literal string \"0\" as the HMAC signing key instead of the key parameter, making every HAXcms instance compute identical HMACs for the same input. Then, after computing the HMAC, the function concatenates the real key parameter which is \"this.privateKey + this.salt\", the system\u2019s master signing secret is directly onto the output. The combined buffer is base64-encoded and returned as the token. Every base64url token produced has the same structure: 32 bytes HMAC keyed with \"0\" and N bytes of `privateKey+salt`. An attacker base64-decodes any token, discards the first 32 bytes, and reads the private key directly. The `/system/api/connectionSettings` endpoint is unauthenticated and returns multiple tokens generated by this function. A single GET request to this endpoint exposes the private key. The PHP backend implements this function correctly with the actual key and returns only the hash. The PHP version produces 44-character tokens whereas the broken Node.js version produces 139+ character tokens. Version 26.0.0 fixes the issue."}, {"lang": "es", "value": "HAX CMS ayuda a gestionar el universo de micrositios con backends de PHP o NodeJs. Antes de la versi\u00f3n 26.0.0, la funci\u00f3n \u2019hmacBase64()\u2019 en el backend de Node.js de HAXcms contiene dos errores cr\u00edticos de implementaci\u00f3n criptogr\u00e1fica que, en conjunto, permiten a cualquier atacante no autenticado extraer la clave de firma privada del sistema y falsificar JSON Web Tokens (JWTs) arbitrarios de nivel de administrador, lo que les permite obtener acceso de administrador completo con una \u00fanica solicitud HTTP. Primero, la funci\u00f3n pasa la cadena literal \u20190\u2019 como clave de firma HMAC en lugar del par\u00e1metro de clave, lo que hace que cada instancia de HAXcms calcule HMAC id\u00e9nticos para la misma entrada. Luego, despu\u00e9s de calcular el HMAC, la funci\u00f3n concatena el par\u00e1metro de clave real, que es \u2019this.privateKey + this.salt\u2019, el secreto de firma maestro del sistema, directamente a la salida. El b\u00fafer combinado se codifica en base64 y se devuelve como el token. Cada token base64url producido tiene la misma estructura: 32 bytes HMAC con clave \u20190\u2019 y N bytes de \u2019privateKey+salt\u2019. Un atacante decodifica en base64 cualquier token, descarta los primeros 32 bytes y lee la clave privada directamente. El endpoint \u2019/system/API/connectionSettings\u2019 no est\u00e1 autenticado y devuelve m\u00faltiples tokens generados por esta funci\u00f3n. Una \u00fanica solicitud GET a este endpoint expone la clave privada. El backend de PHP implementa esta funci\u00f3n correctamente con la clave real y devuelve solo el hash. La versi\u00f3n de PHP produce tokens de 44 caracteres, mientras que la versi\u00f3n de Node.js defectuosa produce tokens de m\u00e1s de 139 caracteres. La versi\u00f3n 26.0.0 corrige el problema."}], "id": "CVE-2026-46395", "lastModified": "2026-10-26T11:10:00.157", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46395", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-05T19:41:20.331148Z", "version": "2.0.3"}}]}, "published": "2026-06-05T19:16:33.593", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/haxtheweb/issues/security/advisories/GHSA-6c8g-9hfh-pq5h"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/haxtheweb/issues/security/advisories/GHSA-6c8g-9hfh-pq5h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}, {"lang": "en", "value": "CWE-321"}, {"lang": "en", "value": "CWE-327"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,26.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "haxcms-nodejs", "source": "cna", "vendor": "haxtheweb"}, "product": "haxcms-nodejs", "vendor": "haxtheweb"}], "created": "2026-06-05T20:30:03.855230+00:00", "updated": "2026-06-05T20:45:04.380766+00:00", "vendors": ["haxtheweb", "haxtheweb$PRODUCT$haxcms-nodejs"]}