CVE-2026-124422 SunEditor 3.0.0 before 3.4.0 Stored XSS via html.clean() Iframe Placeholder

Medium 5.3 Published 8 Nov 2026 Updated 10 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-124422?

CVE-2026-124422 is a medium-severity vulnerability in jihong88 suneditor, published on 8 Nov 2026.

Official description

SunEditor from 3.0.0 before 3.4.0 contains a stored cross-site scripting vulnerability in html.clean() that rebuilds iframes from data-se-iframe-holder-attrs JSON without filtering srcdoc or uppercase SRC keys. Attackers can inject crafted HTML through paste, html.set, or html.insert to execute script in the host page origin when victims load or paste the content.

Weakness: CWE-79

Which versions are affected by CVE-2026-124422?

How do I fix CVE-2026-124422?

No fix has been published for CVE-2026-124422 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-124422 being exploited?

There is no known exploitation of CVE-2026-124422 in the wild and no public exploit code.

Sources

Also known as GHSA-fvm2-c629-pcjf, GHSA-q867-q2hw-f8gp.