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PTC Patches Critical Windchill and FlexPLM Flaw That Could Enable Remote Code Execution

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PTC Patches Critical Windchill and FlexPLM Flaw That Could Enable Remote Code Execution

PTC has released patches for a new critical vulnerability impacting Windchill and FlexPLM software that, if successfully exploited, could result in remote code execution.

The security flaw, tracked as CVE-2026-126325, carries a CVSS v4 score of 9.2 out of a maximum of 10.0.

It has been described as a case of improper input validation and deserialization of untrusted data that could result in remote code execution via crafted requests.

"A critical remote code execution (RCE) vulnerability has been reported in PTC Windchill and PTC FlexPLM," according to a description of the flaw on CVE.org. "The vulnerability may be exploited through the deserialization of untrusted data."

"If your Windchill or FlexPLM environment is hosted by PTC, the patches have been applied on their behalf. No action is required on your part," PTC said in a statement posted on its website.

"If your Windchill or FlexPLM environment is not hosted by PTC, we urge you to apply the patch as soon as possible to help protect your systems."

The disclosure comes nearly five months after another critical remote code execution (RCE) issue in Windchill and FlexPLM (CVE-2026-12569, CVSS score: 9.3) came under active exploitation.

Then, in July 2026, it emerged that threat actors linked to the Cl0p ransomware operation were weaponizing the flaw as part of a data extortion campaign designed to drop JSP web shells and exfiltrate sensitive product data from manufacturing companies and industrial enterprises.

"PTC software is a textbook target for initial access brokers and ransomware operators and a significant enabler of triple extortion campaigns," Yordan Ganchev, principal threat intelligence specialist at watchTowr, said in a statement shared with The Hacker News.


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