CVE-2026-77645 Critical Remote Code Execution (RCE) vulnerability reported in Windchill
Attackers can execute arbitrary code remotely via unsafe deserialization in PTC Windchill and FlexPLM, requiring immediate patching.
- 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-2026-77645?
CVE-2026-77645 is a critical unsafe deserialization vulnerability in PTC FlexPLM, published on 20 Aug 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.
Which versions are affected by CVE-2026-77645?
How do I fix CVE-2026-77645?
No fix has been published for CVE-2026-77645 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-2026-77645 being exploited?
There is no known exploitation of CVE-2026-77645 in the wild and no public exploit code.
Sources
Also known as GHSA-qxmv-9q88-wwmw.