CVE-2026-4681 Critical Remote Code Execution vulnerability reported in Windchill
Attackers can execute arbitrary code on PTC Windchill and FlexPLM servers by exploiting a deserialization vulnerability in untrusted data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4681?
CVE-2026-4681 is a critical unsafe deserialization vulnerability in PTC FlexPLM, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A critical remote code execution (RCE) vulnerability has been reported in PTC Windchill and PTC FlexPLM. The vulnerability may be exploited through the deserialization of untrusted data.
This issue affects Windchill PDMLink: 11.0 M030, 11.1 M020, 11.2.1.0, 12.0.2.0, 12.1.2.0, 13.0.2.0, 13.1.0.0, 13.1.1.0, 13.1.2.0, 13.1.3.0; FlexPLM: 11.0 M030, 11.1 M020, 11.2.1.0, 12.0.0.0, 12.0.2.0, 12.0.3.0, 12.1.2.0, 12.1.3.0, 13.0.2.0, 13.0.3.0.
Weakness: CWE-94
Which versions are affected by CVE-2026-4681?
How do I fix CVE-2026-4681?
No fix has been published for CVE-2026-4681 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-4681 being exploited?
There is no known exploitation of CVE-2026-4681 in the wild and no public exploit code.
Sources
Also known as GHSA-jfrx-fmg3-3p8m.