CVE-2026-90443 Cross-site Scripting in Malcolm
Unauthenticated attackers can execute arbitrary scripts and redirect users via crafted links in the Malcolm web interface, potentially compromising user sessions.
- 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-2026-90443?
CVE-2026-90443 is a medium-severity cross-site scripting vulnerability in CISA Malcolm, published on 11 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
A web interface reflects a portion of the request URL into a script context and a hyperlink attribute without adequate encoding, and does not require authentication to reach. This allows an unauthenticated network attacker to craft a link that, when visited by a user, executes arbitrary script in the context of the affected application and can redirect the user's browser to an arbitrary external site. Successful exploitation could allow an attacker to act with the compromised user's session privileges within the application.
Weakness: CWE-79
Which versions are affected by CVE-2026-90443?
How do I fix CVE-2026-90443?
No fix has been published for CVE-2026-90443 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-2026-90443 being exploited?
There is no known exploitation of CVE-2026-90443 in the wild and no public exploit code.
Sources
Also known as GHSA-w76j-wwhj-ch25.