What is CVE-2026-56704?

CVE-2026-56704 is a medium-severity vulnerability in Vrana Adminer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-25.

How severe is CVE-2026-56704?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Vrana Adminer

CVE-2026-56704

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.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Vrana Adminer

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-56704?: CVE-2026-56704 is a medium-severity vulnerability in Vrana Adminer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-25.
How severe is CVE-2026-56704?: Medium severity. CVSS v3 base score is 6.1 out of 10.