CVE-2026-25892: Adminer has an Unauthenticated Persistent DoS via Array Injection in ?script=version Endpoint

February 10, 2026

Adminer v5.4.1 has a version check mechanism where adminer.org sends signed version info via JavaScript postMessage, which the browser then POSTs to ?script=version. This endpoint lacks origin validation and accepts POST data from any source. An attacker can POST version[] parameter which PHP converts to an array. On next page load, openssl_verify() receives this array instead of string and throws TypeError, returning HTTP 500 to all users.

References

github.com/advisories/GHSA-q4f2-39gr-45jh
github.com/vrana/adminer
github.com/vrana/adminer/commit/21d3a3150388677b18647d68aec93b7850e457d3
github.com/vrana/adminer/releases/tag/v5.4.2
github.com/vrana/adminer/security/advisories/GHSA-q4f2-39gr-45jh
nvd.nist.gov/vuln/detail/CVE-2026-25892

Code Behaviors & Features

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