CVE-2026-56704

Medium

Description

Adminer before 5.4.3 inserts unsanitized database server version strings into script tags with valid CSP nonces without proper validation. Attackers controlling a rogue MySQL server can return crafted version strings that break out of the JavaScript context and execute arbitrary code, bypassing Content Security Policy protections.

SeverityMedium

CVSS6.1

Exploit probability—

Product

Vrana Adminer

PublishedAug 25, 2026

First seenAug 25, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

vrana adminer5.4.3 or later

Vendor advisories

github.com/vrana/adminer/security/advisories/GHSA-h6jr-7pr6-grgj

Affected products

Product	Affected versions	Fixed in
vrana adminer	v < 5.4.3	5.4.3

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