CVE-2026-63353 Cross-site scripting in SIMATIC Drive Controller CPU 1504D TF
Attackers can execute arbitrary JavaScript in a user's browser via crafted trace files, enabling unauthorized PLC operations within the user's authorization scope.
- 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-2026-63353?
CVE-2026-63353 is a critical cross-site scripting vulnerability in Siemens SIMATIC Drive Controller CPU 1504D TF, published on 13 Oct 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
Affected devices do not properly sanitize comment fields contained in imported trace files before rendering them on the Trace page. This could allow an attacker to social engineer an authorized user who holds the function right “Read diagnostics” into importing a specially crafted trace file. Successful exploitation could allow attacker-controlled JavaScript to execute in the user’s browser session and perform PLC operations through the web server within the scope of the user’s authorization.
Weakness: CWE-79
Which versions are affected by CVE-2026-63353?
How do I fix CVE-2026-63353?
No fix has been published for CVE-2026-63353 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-2026-63353 being exploited?
There is no known exploitation of CVE-2026-63353 in the wild and no public exploit code.
Sources
Also known as GHSA-qm94-q84w-4cgf.