Stored Cross-Site Scripting in SunEditor FileUpload Plugin
CVE-2026-124491

5.3MEDIUM

Key Information:

Vendor

Jihong88

Status
Suneditor
Vendor
CVE Published:
8 November 2026

What is CVE-2026-124491?

A stored cross-site scripting vulnerability exists in SunEditor prior to version 3.4.0, specifically within the FileUpload plugin's create() method. This flaw allows attackers to upload files with HTML-infused names that are assigned to innerHTML without proper escaping. This can lead to JavaScript execution in the browsers of users loading these files, facilitating session theft and other malicious activities. It is crucial for users to update to the latest version to mitigate these risks.

Affected Version(s)

suneditor 0 < 3.4.0

suneditor 3.4.0

References

https://github.com/JiHong88/suneditor/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/suneditor-before-3.4...
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

iElloc
.