CVE-2026-25892

HIGH NUCLEI

Adminer < 5.4.2 - Denial of Service via Unvalidated Version Check POST

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2026-25892 has a Nuclei detection template available — see the Nuclei card below for the Shodan/FOFA recon queries.

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.

Nuclei Templates (1)

Adminer 4.6.2 - 5.4.1 Unauthenticated Persistent DoS
HIGHVERIFIEDby DhiyaneshDk
Shodan: http.title:"Adminer"
FOFA: title="Adminer" || body="Adminer"

References (3)

Core 3

Scores

CVSS v3 7.5
EPSS 0.0416
EPSS Percentile 89.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-20
Status published
Products (2)
adminer/adminer 4.6.2 - 5.4.2
vrana/adminer 4.6.2 - 5.4.2Packagist
Published Feb 09, 2026
Tracked Since Feb 18, 2026