CVE-2026-56706Adminer before 5.4.3 CSRF Token Secret Recovery via XOR Masking
Description
Adminer before 5.4.3 uses a CSRF token scheme that transmits both the XOR mask and the masked value in every token (format (rand XOR secret):rand), allowing anyone who observes a single CSRF token (e.g., via network sniffing, log files, Referrer header, or XSS) to recover the session secret with a single XOR operation and forge unlimited valid tokens. The implementation is further weakened by a low-entropy session token (rand(1,1e6), ~20 bits) that permits blind brute-force, and by use of loose comparison (==) in token verification, enabling PHP type juggling. Exploitation enables cross-site request forgery against authenticated sessions, including execution of arbitrary SQL queries.
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
References and patches
- GitHub Security Advisory (GHSA-33j4-hc95-pggg) vendor-advisory
- VulnCheck Advisory: Adminer before 5.4.3 CSRF Token Secret Recovery via XOR Masking third-party-advisory