Critical 9.3

SunEditor before 3.4.0 Stored XSS via &colon; Entity Sanitizer Bypass

CVE-2026-124494 First seen on SecPulse Nov 8, 22:16

Affected packages

Ecosystem	Package	Affected → Fixed	Fixed
JiHong88	JiHong88suneditor	< 3.4.0→ 3.4.0	3.4.0

Original description The description as published by the source.

SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability because the html.clean() sanitizer's _normalizeURL() function decodes named entities like : to an empty string. Attackers can inject href values such as javascript: that pass the _isSafeURL() check but are decoded by browsers, executing JavaScript when victims click stored links.

Source: CVE.org (CVE Program・cvelistV5) NVD GitHub Advisory

References

Key facts

CVSS v4: Critical 9.3; CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Published: Nov 8, 2026
First seen on SecPulse: Nov 8, 22:16
GHSA: GHSA-v4jx-8pj6-w4w8
CWE: CWE-79

NVD GitHub Advisory

Tags(click for explanation)

Programming Languages

JavaScript

Attack Types

Cross-Site Scripting

CWE

CWE-79

All

Jihong88 Suneditor

Detection sources

OSV.dev (Open Source Vulnerabilities)Nov 10, 11:31
NIST National Vulnerability Database03:17
GitHub Security Advisories (Global)Nov 9, 00:31
CVE.org (CVE Program・cvelistV5)02:53