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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (25.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/vrana/adminer/security/advisories/GHSA-h6jr-7pr6-grgj (vendor-advisory)
- www.vulncheck.com/advisories/adminer-before-cross-site-scripting-via-mysql-vers… (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.