RCE in Ueditor
CVE-2026-4186
A vulnerability was determined in UEditor up to 1.4.3.2. This issue affects some unknown processing of the file php/controller.php?action=uploadimage of the component JSONP Callback Handler. This manipulation of the argument callback causes cross site scripting. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (15.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
Affected products
- N/a Ueditor — versions 1.4.3.0, 1.4.3.1, 1.4.3.2
Weakness classification (CWE)
References
- cna@vuldb.com (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (exploit)
Frequently asked questions
- What is CVE-2026-4186?
- CVE-2026-4186 is a low-severity vulnerability in Ueditor, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-03-16.
- How severe is CVE-2026-4186?
- Low severity. CVSS v3 base score is 3.5 out of 10.