CVE-2026-56704
Adminer before 5.4.3 Cross-Site Scripting via MySQL Version String
- State
- Published
- Severity
- 5.3 Medium
- Published
- Aug 25, 2026
- Updated
- Aug 26, 2026
- Reserved
- Jun 22, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
adminervrana |
|
References
- GitHub Security Advisory (GHSA-h6jr-7pr6-grgj)vendor-advisory
- VulnCheck Advisory: Adminer before 5.4.3 Cross-Site Scripting via MySQL Version Stringthird-party-advisory
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