{
  "schema_version": "1.4.0",
  "id": "GHSA-h9w6-f932-gq62",
  "modified": "2025-04-18T18:34:51Z",
  "published": "2025-04-18T15:10:05Z",
  "aliases": [
    "CVE-2025-32792"
  ],
  "summary": "ses's global contour bindings leak into Compartment lexical scope",
  "details": "### Impact\n\nWeb pages and web extensions using `ses` and the `Compartment` API to evaluate third-party code in an isolated execution environment that have also elsewhere used `const`, `let`, and `class` bindings in the top-level scope of a `<script>` tag will have inadvertently revealed these bindings in the lexical scope of third-party code.\n\n### Patches\n\nThis compromise is addressed in `ses` version `1.12.0`. The mechanism for confining third-party code involves a `with` block and a semi-opaque scope `Proxy`. The proxy previously revealed any named property to the surrounding lexical scope if it were absent on `globalThis`, so that the third-party code would receive an informative `ReferenceError`, relying on the invalid assumption that only properties of `globalThis` are in the top-level lexical scope. The solution makes the scope proxy fully opaque. Consequently, accessing an unbound free lexical name will produce `undefined` instead of throwing `ReferenceError`.\nAssigning to an unbound free lexical name will continue to throw a `ReferenceError`.\n\n### Workarounds\n\nThis problem can be mitigated either by avoiding top-level `let`, `const`, or `class` bindings in `<script>` tags, which is an existing industry best-practice, or change these to `var` bindings to be reflected on `globalThis`, or upgrade `ses` to version `1.12.0` or greater.\n\nSome bundlers by default transform top-level `let`, `const`, and `class` bindings to `var`.\n\n### Disclosure\n\nThis vulnerability was disclosed by @mingijunggrape in the course of their studies at UNIST (Ulsan National Institute of Science and Technology) as a member of the Web Security Lab (https://websec-lab.github.io/).",
  "severity": [
    {
      "type": "CVSS_V4",
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "ses"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.12.0"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/endojs/endo/security/advisories/GHSA-h9w6-f932-gq62"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-32792"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/endojs/endo"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-497"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2025-04-18T15:10:05Z",
    "nvd_published_at": "2025-04-18T16:15:23Z"
  }
}