Adminer is open-source database management software. Adminer v5.4.1 and earlier 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. Upgrade to Adminer 5.4.2.
Adminer References: https://github.com/vrana/adminer/security/advisories/GHSA-q4f2-39gr-45jh https://github.com/vrana/adminer/commit/21d3a3150388677b18647d68aec93b7850e457d3 Remediation: Upgrade to Adminer 5.4.2 or later.
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