{"id":"GHSA-5957-5c94-3v7w","summary":"Jodit has prototype pollution via Jodit.configure() / ConfigMerge","details":"### Summary\n`Jodit.configure(options)` — and the internal `ConfigMerge` / `ConfigProto` helpers — merged user-supplied options into the editor configuration without filtering prototype-mutating keys. A payload nested under an existing plain-object option such as `controls` could reach and mutate `Object.prototype` (prototype pollution).\n\n### Affected\n- Package: `jodit` (npm)\n- Versions: `\u003c 4.12.18`\n- Public API: `Jodit.configure(options)`\n\n### Proof of Concept\n```js\nimport { Jodit } from 'jodit';\ndelete Object.prototype.polluted;\nJodit.configure(JSON.parse('{\"controls\":{\"__proto__\":{\"polluted\":\"yes\"}}}'));\nconsole.log(({}).polluted); // \"yes\" (before the fix)\ndelete Object.prototype.polluted;\n```\n\n### Impact\nApplications that pass user-controlled or partially user-controlled configuration into `Jodit.configure()` could be vulnerable to prototype pollution: unexpected property injection, logic bypass, denial of service, or secondary security issues.\n\n### Patch\nFixed in 4.12.18 by rejecting `__proto__`, `constructor`, and `prototype` at every merge level in `ConfigMerge` and `ConfigProto`.\n\n### Credit\nResponsibly reported by Junming Wu.","aliases":["CVE-2026-54756"],"modified":"2026-07-31T19:15:24.222131123Z","published":"2026-07-31T19:10:16Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-07-31T19:10:16Z","nvd_published_at":"2026-07-01T21:17:03Z","cwe_ids":["CWE-1321"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/xdan/jodit/security/advisories/GHSA-5957-5c94-3v7w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54756"},{"type":"WEB","url":"https://github.com/xdan/jodit/commit/d298397bc993793b17145806c15f7dae53f90104"},{"type":"PACKAGE","url":"https://github.com/xdan/jodit"},{"type":"WEB","url":"https://github.com/xdan/jodit/releases/tag/4.12.18"}],"affected":[{"package":{"name":"jodit","ecosystem":"npm","purl":"pkg:npm/jodit"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.12.18"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-5957-5c94-3v7w/GHSA-5957-5c94-3v7w.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"}]}