AdminNeo: CSRF Token Secret Recoverable from Single Observed Token, Enabling Cross-Site Request Forgery
Medium · CVSS 6.8 (GHSA) · fetched 2026-10-30
### Summary AdminNeo's CSRF protection uses a BREACH-resistant XOR masking scheme, but the implementation transmits both the XOR mask and the masked value in every token. This allows any observer who sees a single CSRF token (via network sniffing, log files, Referrer header, or XSS) to instantly recover the session secret and forge unlimited valid CSRF tokens. Additionally, the underlying session token has only ~20 bits of entropy (`rand(1, 1e6)`), making blind brute-force feasible even without token observation.
Remediation
Upgrade adminneo-org/adminneo to 5.5.1 or later.
Affected PHP branches
See the source advisory.
Source: GitHub Global Security Advisories (Composer ecosystem) · retrieved 2026-10-30T20:20:13-04:00 · https://github.com/advisories/GHSA-wm25-49w3-5qrg