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    CVE-2026-63771

    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.

    Published:Jul 20, 2026
    Last Modified:Jul 28, 2026
    EPS:Jul 20, 2026
    EPSS Score:0.00243
    CVSS Score:7.1

    Affected Products

    Vendor
    Adminer
    Product
    Adminer
    Vendor
    Vrana
    Product
    Adminer

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-56706 (CVSS 6.1) — Adminer before 5.4.3 uses a CSRF token scheme that transmits both the XOR mask and the masked value in every t…
    CVE-2026-56705 (CVSS 9.3) — Adminer before 5.4.3 fails to sanitize the server field before constructing a PDO DSN string, allowing unauthe…
    CVE-2026-56704 (CVSS 5.3) — Adminer before 5.4.3 inserts unsanitized database server version strings into script tags with valid CSP nonce…
    CVE-2026-56703 (CVSS 8.6) — Adminer before 5.4.3 contains a remote code execution vulnerability in SQLite query handling where VACUUM INTO…
    CVE-2026-56702 (CVSS 7.1) — Adminer versions before 5.4.3 contain an unrestricted file upload vulnerability in the AdminerFileUpload plugi…
    CVE-2026-34968 (CVSS 7.2) — Adminer before 5.4.3 contains an arbitrary file deletion vulnerability in SQLite mode where the database-list …
    CVE-2026-34967 (CVSS 5.3) — Adminer versions 5.3.0 through 5.4.2 with the sql-log plugin enabled contain an arbitrary file write vulnerabi…
    CVE-2026-34964 (CVSS 6.9) — Adminer before 5.5.0 contains a server-side request forgery vulnerability in the login form's server field val…
    CVE-2026-34959 (CVSS 5.3) — Adminer 4.6.0 before 5.5.0 prepends the client-supplied X-Forwarded-Prefix header to $_SERVER["REQUEST_URI"] w…
    CVE-2026-16434 (CVSS 2.3) — Adminer 4.6.0 through 5.5.0 (fixed in 5.5.1) contains an incomplete fix for a prior X-Forwarded-Prefix vulnera…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High