CVE-2026-63771
Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-113 |
| Vendor | vrana |
| Product | adminer |
| Published | Jul 20, 2026 |
| Last Updated | Jul 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
vrana / adminer
0 < 5.4.3
References
github.com: https://github.com/vrana/adminer/issues/1298 github.com: https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h github.com: https://github.com/vrana/adminer/releases#release-v5.4.3 vulncheck.com: https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-header
Credits
George Chen