What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-09 · updated 2026-06-17
• Weakness: CWE-20

Description

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.

Affected products

• vrana adminer: from 4.6.2 before 5.4.2 — fixed in 5.4.2

How to fix

Upgrade to a fixed version: vrana adminer 5.4.2. Check the vendor advisory for mitigations.

References

• https://github.com/vrana/adminer/commit/21d3a3150388677b18647d68aec93b7850e457d3
• https://github.com/vrana/adminer/releases/tag/v5.4.2
• https://github.com/vrana/adminer/security/advisories/GHSA-q4f2-39gr-45jh

Get alerted when CVE-2026-25892 or the next vulnerability affects your stack