CVE-2026-49243 Webmin: Reflected XSS in the Configuration module
Attackers can execute arbitrary commands via reflected XSS in Webmin's Configuration module by tricking users into clicking malicious links.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-49243?
CVE-2026-49243 is a critical cross-site scripting vulnerability in webmin, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Webmin is a web-based system administration tool for Unix-like servers. Prior to version 2.650, Webmin users who click on a malicious link to their server are vulnerable to this XSS vulnerability that could be used to execute attacker-controlled commands. This issue has been patched in version 2.650.
Weakness: CWE-79
Which versions are affected by CVE-2026-49243?
How do I fix CVE-2026-49243?
No fix has been published for CVE-2026-49243 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-49243 being exploited?
There is no known exploitation of CVE-2026-49243 in the wild and no public exploit code.
Sources
Also known as GHSA-hv4w-p8jq-2rp5.