GHSA-5957-5C94-3V7W

Vulnerability from github – Published: 2026-07-31 19:10 – Updated: 2026-07-31 19:10
VLAI
Summary
Jodit has prototype pollution via Jodit.configure() / ConfigMerge
Details

Summary

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).

Affected

  • Package: jodit (npm)
  • Versions: < 4.12.18
  • Public API: Jodit.configure(options)

Proof of Concept

import { Jodit } from 'jodit';
delete Object.prototype.polluted;
Jodit.configure(JSON.parse('{"controls":{"__proto__":{"polluted":"yes"}}}'));
console.log(({}).polluted); // "yes" (before the fix)
delete Object.prototype.polluted;

Impact

Applications 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.

Patch

Fixed in 4.12.18 by rejecting __proto__, constructor, and prototype at every merge level in ConfigMerge and ConfigProto.

Credit

Responsibly reported by Junming Wu.

Severity
6.3 (Medium)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "jodit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.12.18"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54756"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-31T19:10:16Z",
    "nvd_published_at": "2026-07-01T21:17:03Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n`Jodit.configure(options)` \u2014 and the internal `ConfigMerge` / `ConfigProto` helpers \u2014 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 \u0027jodit\u0027;\ndelete Object.prototype.polluted;\nJodit.configure(JSON.parse(\u0027{\"controls\":{\"__proto__\":{\"polluted\":\"yes\"}}}\u0027));\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.",
  "id": "GHSA-5957-5c94-3v7w",
  "modified": "2026-07-31T19:10:17Z",
  "published": "2026-07-31T19:10:16Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Jodit has prototype pollution via Jodit.configure() / ConfigMerge"
}



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