Prototype pollution in Jodit Editor - #VU166183
Published: November 13, 2026
Vulnerability identifier: #VU166183
CSH Severity: Medium
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to modify Object.prototype across the JavaScript runtime and cause a denial of service.
The vulnerability exists due to prototype pollution in Jodit Editor's extendLang() helper when merging untrusted language dictionaries without filtering dangerous keys. A remote attacker can supply a language pack containing {"__proto__": {"toString": 1}} through downstream application or plugin code to overwrite an inherited method and disrupt ordinary object string coercion.
Affected software
Jodit Editor
Remediation
Install security update from vendor's website.
Jodit Editor - update to 4.19.14