Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header

{
  "id": "2bf28cd431da9e4319650051827167eb7300fa11a93f02d98d6753dac7ac30b9",
  "url": "https://osv.dev/vulnerability/CVE-2026-63771",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header",
    "summary": "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.",
    "evidence": "osv:CVE-2026-63771",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-63771",
      "aliases": [
        "CVE-2026-63771",
        "GHSA-c533-9qwm-8w5h"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vrana/adminer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "189869c4a8f0f897848cdb58493b572178084d6c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.4.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.4.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.4.2",
            "v5.4.1",
            "v5.4.0",
            "v5.3.0",
            "v5.2.1",
            "v5.2.0",
            "v5.1.1",
            "v5.1.0",
            "v5.0.6",
            "v5.0.5",
            "v5.0.4",
            "v5.0.3",
            "v5.0.2",
            "v5.0.1",
            "v5.0.0",
            "v4.17.1",
            "v4.17.0",
            "v4.16.0",
            "v4.8.1",
            "v4.8.0",
            "v4.7.9",
            "v4.7.8",
            "v4.7.7",
            "v4.7.5",
            "v4.7.4",
            "v4.7.3",
            "v4.7.2",
            "v4.7.1",
            "v4.7.0",
            "v4.6.3",
            "v4.6.2",
            "v4.6.1",
            "v4.6.0",
            "v4.5.0",
            "v4.4.0",
            "v4.3.1",
            "v4.3.0",
            "v4.2.5",
            "v4.2.4",
            "v4.2.3",
            "v4.2.2",
            "v4.2.1",
            "v4.2.0",
            "v4.1.0",
            "v4.0.3",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v3.7.1",
            "v3.7.0",
            "v3.6.4",
            "v3.6.3",
            "v3.6.2",
            "v3.6.1",
            "v3.6.0",
            "v3.5.1",
            "v3.5.0",
            "v3.4.0",
            "v3.3.4",
            "v3.3.3",
            "v3.3.2",
            "v3.3.1",
            "v3.3.0",
            "v3.2.2",
            "v3.2.1",
            "v3.2.0",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63771.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.610619564Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63771.json",
        "https://github.com/vrana/adminer/releases#release-v5.4.3",
        "https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63771",
        "https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-header",
        "https://github.com/vrana/adminer/issues/1298",
        "https://github.com/vrana/adminer"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-113"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63771.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63771",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489185,
  "published_at": "2026-07-20T18:57:15.799+00:00"
}