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Advisories

SunEditor before 3.4.0 Stored XSS via : Entity Sanitizer Bypass

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Severity
critical
Date
Affecting

  • suneditor >= 0, < 3.4.0

CWE
  • CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS
9.3
CVSS V4 Vector
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
Credit
1diot9
Description
SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability because the html.clean() sanitizer's _normalizeURL() function decodes named entities like &colon; to an empty string. Attackers can inject href values such as javascript&colon; that pass the _isSafeURL() check but are decoded by browsers, executing JavaScript when victims click stored links.

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