{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "5.4.3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "189869c4a8f0f897848cdb58493b572178084d6c"
            }
          ],
          "repo": "https://github.com/vrana/adminer",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-c533-9qwm-8w5h"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-113"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63771.json"
  },
  "details": "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.",
  "id": "CVE-2026-63771",
  "modified": "2026-07-22T05:30:11.784152450Z",
  "published": "2026-07-20T18:57:15.799Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63771.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vrana/adminer/releases#release-v5.4.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63771"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-header"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/vrana/adminer/issues/1298"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vrana/adminer"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Adminer \u003c 5.4.3 Cookie Injection via X-Forwarded-Prefix Header"
}