CVE-2026-46395
CriticalCVSS 9.3Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
HAX CMS, który zarządza mikrositami z backendem PHP lub Node.js, przed wersją 26.0.0 zawierał krytyczne błędy w implementacji kryptograficznej w funkcji `hmacBase64()`. Te błędy pozwalały nieautoryzowanym atakującym na wydobycie prywatnego klucza podpisywania systemu oraz fałszowanie tokenów JWT, co umożliwiało pełny dostęp administracyjny za pomocą jednego żądania HTTP.
Risk Assessment
Organizacje korzystające z HAX CMS są narażone na poważne ryzyko, ponieważ atakujący mogą uzyskać pełne uprawnienia administracyjne, co może prowadzić do nieautoryzowanego dostępu do danych i zasobów systemowych. Wykorzystanie tej podatności może skutkować poważnymi konsekwencjami dla bezpieczeństwa i integralności systemu.
Recommendation
Zaleca się aktualizację HAX CMS do wersji 26.0.0 lub nowszej, aby usunąć te krytyczne błędy. Dodatkowo, warto przeprowadzić audyt bezpieczeństwa systemu w celu zidentyfikowania potencjalnych zagrożeń.
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Original NVD description (English source)
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’s 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’s 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

