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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (23.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Ueditor — versions 1.4.3.0, 1.4.3.1, 1.4.3.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- magnificent-dill-351.notion.site/JSONP-Injection-in-ueditor-1-4-3-2-317c693918e… (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.