GHSA-VPMM-X3FM-QR5C

Vulnerability from github – Published: 2026-06-18 13:05 – Updated: 2026-06-18 13:05
VLAI
Summary
jodit: Prototype pollution in Jodit via Jodit.modules.Helpers.set()
Details

Summary

Jodit.modules.Helpers.set(chain, value, obj) walks the dot-separated chain, creating and following each path segment, without filtering prototype-mutating keys. A chain that begins with (or contains) __proto__, constructor, or prototype lets the final assignment reach and mutate Object.prototype (prototype pollution).

Affected

  • Package: jodit (npm)
  • Versions: < 4.12.26
  • Public API: Jodit.modules.Helpers.set(chain, value, obj)

Proof of Concept

const { Jodit } = require('jodit');
delete Object.prototype.polluted;
Jodit.modules.Helpers.set('__proto__.polluted', 'yes', {});
console.log(({}).polluted); // "yes" (before the fix)
delete Object.prototype.polluted;

Impact

Applications that pass a user-controlled or partially user-controlled key path into Jodit.modules.Helpers.set() could be vulnerable to prototype pollution (CWE-1321): unexpected property injection, logic bypass, denial of service, or secondary security issues.

Patch

Fixed in 4.12.26 by rejecting any chain whose segments include __proto__, constructor, or prototype, reusing the same guard introduced for Jodit.configure() in 4.12.18.

Credit

Responsibly reported by Junming Wu.

Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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": "4.12.26"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55886"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-18T13:05:01Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n`Jodit.modules.Helpers.set(chain, value, obj)` walks the dot-separated `chain`, creating and following each path segment, without filtering prototype-mutating keys. A chain that begins with (or contains) `__proto__`, `constructor`, or `prototype` lets the final assignment reach and mutate `Object.prototype` (prototype pollution).\n\n### Affected\n- Package: `jodit` (npm)\n- Versions: `\u003c 4.12.26`\n- Public API: `Jodit.modules.Helpers.set(chain, value, obj)`\n\n### Proof of Concept\n```js\nconst { Jodit } = require(\u0027jodit\u0027);\ndelete Object.prototype.polluted;\nJodit.modules.Helpers.set(\u0027__proto__.polluted\u0027, \u0027yes\u0027, {});\nconsole.log(({}).polluted); // \"yes\" (before the fix)\ndelete Object.prototype.polluted;\n```\n\n### Impact\nApplications that pass a user-controlled or partially user-controlled key path into `Jodit.modules.Helpers.set()` could be vulnerable to prototype pollution (CWE-1321): unexpected property injection, logic bypass, denial of service, or secondary security issues.\n\n### Patch\nFixed in 4.12.26 by rejecting any `chain` whose segments include `__proto__`, `constructor`, or `prototype`, reusing the same guard introduced for `Jodit.configure()` in 4.12.18.\n\n### Credit\nResponsibly reported by Junming Wu.",
  "id": "GHSA-vpmm-x3fm-qr5c",
  "modified": "2026-06-18T13:05:01Z",
  "published": "2026-06-18T13:05:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/xdan/jodit/security/advisories/GHSA-vpmm-x3fm-qr5c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/xdan/jodit"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "jodit: Prototype pollution in Jodit via Jodit.modules.Helpers.set()"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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