CVE-2026-63771
Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header
- State
- Published
- Severity
- 6.0 Medium
- Published
- Jul 20, 2026
- Updated
- Jul 28, 2026
- Reserved
- Jul 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.0 Medium | 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 | VulnCheck |
| 3.1 | 7.1 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N | VulnCheck |
Weaknesses
- CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Affected Products
| Product | Versions |
|---|---|
adminervrana |
|
References
- Researcher Disclosuretechnical-descriptionexploitissue-tracking
- GitHub Security Advisory (GHSA-c533-9qwm-8w5h)vendor-advisory
- Release Notesrelease-notes
- https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-headerthird-party-advisory
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