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CVE-2026-77645 – Remote Code Execution (Insecure Deserialization) – PTC Windchill PDMLink & FlexPLM

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Summary

CVE-2026-77645 is a critical remote code execution vulnerability affecting PTC Windchill PDMLink and PTC FlexPLM, caused by deserialization of untrusted data. The flaw allows a remote attacker to achieve code execution on the affected server, and carries a CVSS v4.0 base score of 9.2 (Critical). PTC published the advisory on August 20, 2026.

Technical details

  • Root cause: improper input validation (CWE-20) combined with deserialization of untrusted data (CWE-502) in Windchill PDMLink and FlexPLM.
  • Trigger condition: an attacker-supplied serialized object is processed by the application, leading to arbitrary code execution when deserialized.
  • Attack vector: network-based; the CVSS v4.0 vector indicates high attack complexity but no privileges or user interaction are required (AV:N/AC:H/AT:N/PR:N/UI:N).
  • Impact: successful exploitation can compromise confidentiality, integrity, and availability of the affected system (VC:H/VI:H/VA:H).

Affected software

  • PTC 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
  • PTC 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

Severity

CVSS v4.0 Base Score: 9.2 (Critical)
Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/AU:Y/R:U/V:C/RE:M/U:Red
(No CVSS v3.1 score has been published by NVD for this CVE as of this writing.)

Mitigation and recommended actions

  • Immediate: Apply the security patch published by PTC in support article CS474826 for the affected Windchill PDMLink and FlexPLM version listed above; consult PTC’s Trust Center advisory for the exact build corresponding to your installed version.
  • If a patch cannot be applied immediately: restrict network access to Windchill/FlexPLM management and application interfaces to trusted networks only, and monitor for anomalous deserialization-related activity or unexpected process execution on the application server.
  • Review PTC’s advisory center for updates, as PTC has issued multiple related Windchill/FlexPLM advisories throughout 2026 and guidance may be updated.

References

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