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Vulnerabilities CVE-2026-63771

CVE-2026-63771

Medium
Open
TLP:CLEAR

Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header

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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.

Details

CVSS Score
6.0
EPSS Score
0.24%

15.6th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Jul 20, 2026
Last Modified
Jul 28, 2026
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