What is CVE-2026-124491?

CVE-2026-124491 is a medium-severity vulnerability in Jihong88 Suneditor, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-11-08.

How severe is CVE-2026-124491?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Jihong88 Suneditor

CVE-2026-124491

SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability in the FileUpload plugin create() method that assigns server-returned file names to innerHTML without escaping. Attackers can upload files with HTML-laden names that bypass html.clean() and execute JavaScript in victims' browsers when content or gallery items load, enabling session theft.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Jihong88 Suneditor

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

GitHub Security Advisory (GHSA-2w4v-r3v4-f5h4) (vendor-advisory)
VulnCheck Advisory: SunEditor before 3.4.0 Stored XSS via FileUpload Plugin Filename (third-party-advisory)

Frequently asked questions

What is CVE-2026-124491?: CVE-2026-124491 is a medium-severity vulnerability in Jihong88 Suneditor, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-11-08.
How severe is CVE-2026-124491?: Medium severity. CVSS v3 base score is 6.4 out of 10.