adminer: Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes...
CVE-2026-63771 is fixed in adminer on 1 platform by DEBIAN-CVE-2026-63771 (version 5.4.3+dfsg-1), released July 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| adminer · Debian 14 | 5.4.3+dfsg-1 | DEBIAN-CVE-2026-63771 | Jul 21, 2026 |
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