Improper input validation in Adminer
CVE-2026-25892
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.021 (81.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.021 · change: +0.005
Affected products
- Adminer
- Vrana Adminer — versions >= 4.6.2, < 5.4.2
Weakness classification (CWE)
References
- github.com/vrana/adminer/security/advisories/GHSA-q4f2-39gr-45jh (Exploit, Vendor Advisory)
- github.com/vrana/adminer/commit/21d3a3150388677b18647d68aec93b7850e457d3 (Patch)
- github.com/vrana/adminer/releases/tag/v5.4.2 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-25892?
- CVE-2026-25892 is a high-severity vulnerability in Adminer, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-02-09.
- How severe is CVE-2026-25892?
- High severity. CVSS v3 base score is 7.5 out of 10.