{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.9.1"
              },
              {
                "fixed": "1.3.1"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "9297612f82dc03585f65b9e1b0eba72a74b0751f"
            },
            {
              "fixed": "91da87c1c23cd6199ba1b0a1c8849a4c605130cc"
            },
            {
              "fixed": "e93a3408a85035e1f90275d02bc2470c96095e56"
            }
          ],
          "repo": "https://github.com/ash-project/ash_admin",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3259-55fp-w94j"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-565"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75757.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "77a43cc4fa04cb59c38fc434568a35a38ecb995a"
          },
          {
            "fixed": "e93a3408a85035e1f90275d02bc2470c96095e56"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Reliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin's session to a different actor, tenant, or authorization mode.\n\nAshAdmin's client JavaScript read its state cookies (tenant, actor_resource, actor_primary_key, actor_action, actor_domain, actor_authorizing, actor_paused) by matching the cookie name with an unanchored regular expression (new RegExp(name + \"=([^;]+)\")) against the whole document.cookie. Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example xactor_authorizing) with Domain=.example.com that flows unvalidated into the admin's LiveSocket connect params. The fix matches cookie names by exact equality.\n\nThis issue affects ash_admin: from 0.9.1 before 1.3.1.",
  "id": "CVE-2026-75757",
  "modified": "2026-09-02T03:30:26.605178698Z",
  "published": "2026-08-31T02:20:17.985Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-75757.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-75757"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75757.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75757"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ash-project/ash_admin/commit/e93a3408a85035e1f90275d02bc2470c96095e56"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ash-project/ash_admin"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a sibling subdomain"
}