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VulnerabilityPublished

CVE-2026-124493: JiHong88 suneditor · Cross-site Scripting

Affects JiHong88 suneditorSource CVE Database V5

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Not known to be exploited · CVSS 9.3 Critical : upgrade to 3.4.0 as a priority.

Data as of 8 Nov 2026, 13:35 UTC

CVSS 4.0 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.09.3
Patch
Available – fixed in 3.4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

Upgrade JiHong88 suneditor to 3.4.0.

Affected software

ProductAffectedFixed in
JiHong88suneditorAffected
  • <3.4.0
Fixed in
  • 3.4.0

AI-suggested

Upgrade SunEditor to version 3.4.0 or later, where this vulnerability is fixed. No other mitigations are indicated by the vendor advisory. Applying the official fix fully addresses the issue.

Description

SunEditor versions prior to 3.4.0 contain a stored cross-site scripting (XSS) vulnerability in the DocumentType constructor. This flaw arises because header textContent is injected into innerHTML without proper HTML escaping, allowing attackers to store entity-encoded HTML in header tags (h1-h6). When editors using document:header mode initialize, this malicious content executes JavaScript, potentially enabling session cookie theft.

References

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