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CVE-2026-34964— Adminer before 5.5.0 SSRF via PDO DSN Injection

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 5.5.0 之前的版本中，登录表单的服务器字段验证器存在服务器端请求伪造（SSRF）漏洞。该验证器仅检查特权端口号的开头是否为整数，未能拒绝非数字形式的端口值。攻击者可以在服务器参数中注入 PDO DSN 键，如 host= 和 port=，从而绕过特权端口限制，在通过身份认证之前，与任意内部主机和端口建立 TCP 连接。

CVSS 5.8 · Medium EPSS 0.31% · P23

Affected Version Matrix 2

VendorProduct Version RangeStatus
vrana adminer < 5.5.0 affected
5.5.0 unaffected
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I. Basic Information for CVE-2026-34964

Vulnerability Information
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Vulnerability Title
Adminer before 5.5.0 SSRF via PDO DSN Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Adminer before 5.5.0 contains a server-side request forgery vulnerability in the login form's server field validator, which only inspects leading integers for privileged ports and fails to reject non-numeric port values. Attackers can inject PDO DSN keys like host= and port= into the server parameter to bypass the privileged-port restriction and establish TCP connections to arbitrary internal hosts and ports before authentication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vrana adminer 0 ~ 5.5.0 -

II. Public POCs for CVE-2026-34964

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III. Intelligence Information for CVE-2026-34964

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Vendor Advisories for CVE-2026-34964 (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-2026-56704 6.1 MEDIUM Adminer before 5.4.3 Cross-Site Scripting via MySQL Version String
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-918

V. Comments for CVE-2026-34964

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