GHSA-vpmm-x3fm-qr5c: jodit: Prototype pollution in Jodit via Jodit.modules.Helpers.set()

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.