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CVE-2026-63771— Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header

Quick assessment

Affected
vrana adminer
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jakub Vrána Adminer是Jakub Vrána个人开发者的一款数据库管理工具。 Jakub Vrána Adminer 5.4.3之前版本存在输入验证错误漏洞，该漏洞源于未清理的X-Forwarded-Prefix HTTP头，导致攻击者能够注入任意值以操纵cookie属性，进而绕过cookie安全控制，降低SameSite保护并启用跨源认证请求。

CVSS 7.1 · High EPSS 0.43% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
vrana adminer < 5.4.3 affected
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I. Basic Information for CVE-2026-63771

Vulnerability Information
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Vulnerability Title
Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header
Source: CVE Program / CVE List V5
Vulnerability Description
Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to downgrade SameSite protection and enable cross-origin authenticated requests, bypassing cookie security controls.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5
Vulnerability Title
Jakub Vrána Adminer 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jakub Vrána Adminer是Jakub Vrána个人开发者的一款数据库管理工具。 Jakub Vrána Adminer 5.4.3之前版本存在输入验证错误漏洞，该漏洞源于未清理的X-Forwarded-Prefix HTTP头，导致攻击者能够注入任意值以操纵cookie属性，进而绕过cookie安全控制，降低SameSite保护并启用跨源认证请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-63771

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 9498 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-63771

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Patches & Fixes for CVE-2026-63771 (1)

Vendor Advisories for CVE-2026-63771 (2)

Vendor Pages for CVE-2026-63771 (1)

IV. Related Vulnerabilities

Same product: adminer
Same vendor: vrana
Same weakness: CWE-113

V. Comments for CVE-2026-63771

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