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CVE-2026-56704— Adminer before 5.4.3 Cross-Site Scripting via MySQL Version String

Quick assessment

Affected
vrana adminer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Adminer 5.4.3 之前的版本中，未经验证处理的数据库服务器版本字符串会被插入到带有有效 CSP（内容安全策略）非ces 量的 标签中。攻击者如果控制了一个恶意的 MySQL 服务器，就可以返回精心构造的版本字符串，从而跳出当前的 JavaScript 执行上下文并执行任意代码，进而绕过内容安全策略（CSP）的保护机制。

CVSS 6.1 · Medium EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
vrana adminer < 5.4.3 affected
5.4.3 unaffected
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I. Basic Information for CVE-2026-56704

Vulnerability Information
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Vulnerability Title
Adminer before 5.4.3 Cross-Site Scripting via MySQL Version String
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vrana adminer 0 ~ 5.4.3 -

II. Public POCs for CVE-2026-56704

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III. Intelligence Information for CVE-2026-56704

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Vendor Advisories for CVE-2026-56704 (2)

Same Patch Batch · vrana · 2026-08-25 · 10 CVEs total

CVE-2026-56705 9.8 CRITICAL Adminer before 5.4.3 Remote Code Execution via MSSQL PDO DSN Injection
CVE-2026-56702 8.8 HIGH Adminer before 5.4.3 Unrestricted File Upload via AdminerFileUpload
CVE-2026-34968 8.1 HIGH Adminer before 5.4.3 Arbitrary File Deletion via SQLite Drop
CVE-2026-56703 7.2 HIGH Adminer before 5.4.3 Remote Code Execution via SQLite VACUUM INTO
CVE-2026-56706 6.8 MEDIUM Adminer before 5.4.3 CSRF Token Secret Recovery via XOR Masking
CVE-2026-34964 5.8 MEDIUM Adminer before 5.5.0 SSRF via PDO DSN Injection
CVE-2026-34967 5.4 MEDIUM Adminer sql-log Plugin 5.3.0 through 5.4.2 Arbitrary File Write
CVE-2026-34959 4.7 MEDIUM Adminer before 5.5.0 Open Redirect via X-Forwarded-Prefix
CVE-2026-16434 2.3 LOW Adminer before 5.5.1 X-Forwarded-Prefix Backslash Bypass

IV. Related Vulnerabilities

Same product: adminer
Same vendor: vrana
Same weakness: CWE-79

V. Comments for CVE-2026-56704

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