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CVE-2026-34959— Adminer before 5.5.0 Open Redirect via X-Forwarded-Prefix

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 4.6.0 至 5.5.0 之前的版本中，应用程序会将客户端提供的 头直接附加到 中，但未进行可信代理检查，也未对前缀值进行任何验证。攻击者可以提供一个绝对 URL（例如 ），该 URL 会被嵌入到 重定向头、 的 属性以及自引用链接中。这导致了以下安全问题： 1. 在状态更改的 POST 请求后，可触发已认证的开放重定向攻击； 2. 可未经认证地控制会话 Cookie 的 属性； 3. 可污染自引用链接。 由于无法注入 CR/LF 字符，因此不会发生 HTTP 头拆分或跨站脚本（XSS）攻击。

CVSS 4.7 · Medium EPSS 0.21% · P11

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-2026-34959

Vulnerability Information
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Vulnerability Title
Adminer before 5.5.0 Open Redirect via X-Forwarded-Prefix
Source: CVE Program / CVE List V5
Vulnerability Description
Adminer 4.6.0 before 5.5.0 prepends the client-supplied X-Forwarded-Prefix header to $_SERVER["REQUEST_URI"] with no trusted-proxy check and no validation of the prefix value. An attacker can supply an absolute URL (e.g. X-Forwarded-Prefix: https://evil.example) that flows into Location redirect headers, the Set-Cookie path attribute, and self-referential links. This enables an authenticated open redirect after state-changing POSTs, unauthenticated control of the session cookie path attribute, and poisoning of self-referential links; CR/LF cannot be injected, so header splitting/XSS is not possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
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-2026-34959

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III. Intelligence Information for CVE-2026-34959

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Vendor Advisories for CVE-2026-34959 (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-2026-34964 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-2026-16434 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-20

V. Comments for CVE-2026-34959

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