{"id":"CVE-2026-54756","aliases":["GHSA-5957-5c94-3v7w"],"url":"https://o3.security/vulnerability/CVE-2026-54756","summary":"Jodit Editor: 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: `< 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.","published":"2026-07-01T20:29:17.924Z","modified":"2026-10-28T02:30:44.697487560Z","cvss":null,"epss":{"score":0.00462,"percentile":0.39067,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"jodit","fixedVersion":"4.12.18"}],"fix":{"url":"https://github.com/xdan/jodit/commit/d298397bc993793b17145806c15f7dae53f90104","label":"xdan/jodit@d298397"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54756.json"},{"type":"ADVISORY","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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:44.697487560Z"}}