{"id":"CVE-2025-32792","aliases":["GHSA-h9w6-f932-gq62"],"url":"https://o3.security/vulnerability/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/).","published":"2025-04-18T16:04:16.778Z","modified":"2026-08-12T03:51:12.478005694Z","cvss":null,"epss":{"score":0.00537,"percentile":0.42838,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"ses","fixedVersion":"1.12.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/32xxx/CVE-2025-32792.json"},{"type":"ADVISORY","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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:12.478005694Z"}}