CVE-2026-4186Public exploitNetwork attack vector

Cross-site scripting via attacker-selected JSONP callback

Published Mar 15, 2026 · Updated Mar 15, 2026

Cross-site scripting in Baidu UEditor 1.4.3.0 through 1.4.3.2 allows remote authenticated users to run script via a JSONP callback. The JSONP handler in php/controller.php accepts callback as a JavaScript identifier and emits it as a function call around the upload response. A victim must load the crafted upload URL; the selected callback then executes in the UEditor deployment's origin and can modify page content.

CVSS severity3.5
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Baidu UEditor 1.4.3.0 through 1.4.3.2 allows remote authenticated users to run script via a JSONP callback. The JSONP handler in php/controller.php accepts callback as a JavaScript identifier and emits it as a function call around the upload response. A victim must load the crafted upload URL; the selected callback then executes in the UEditor deployment's origin and can modify page content.

The record

CVE
CVE-2026-4186
Published
Mar 15, 2026
Updated
Mar 15, 2026
Vendor
Baidu
Product
UEditor
Classifications
CWE-94, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.4.3.0
  2. Affected versionversion=1.4.3.1
  3. Affected versionversion=1.4.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Baidu · UEditorversion=1.4.3.0; version=1.4.3.1; version=1.4.3.2

Published CVSS scores

2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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