CISA: PTC Windchill and FlexPLM Improper Input Validation Vulnerability
CVSS 4.0
9.3critical
EPSS
41%p99
Published
()
KEV added
AI analysis
PTC Windchill and FlexPLM contain an improper input validation flaw (CWE-20) with an associated deserialization of untrusted data weakness (CWE-502) that allows an unauthenticated, remote attacker to execute arbitrary code by sending a malicious request over the network. An attacker who can reach a vulnerable Windchill or FlexPLM server can run arbitrary code on it, potentially gaining a foothold for lateral movement; CISA notes the flaw is being used in ransomware campaigns. All organizations running PTC Windchill or FlexPLM are affected, and the available data does not specify affected version ranges. The vulnerability was added to CISA's Known Exploited Vulnerabilities catalog on 2026-06-25 with known ransomware use, and EPSS assigns a 40.6% probability of exploitation within 30 days (99th percentile). No CVSS score or public proof-of-concept is available yet, but the KEV listing confirms exploitation in the wild.
What to do: Apply the fixes in PTC's security advisory for CVE-2026-12569 to both Windchill and FlexPLM as soon as possible, prioritizing internet-facing instances, and comply with the CISA KEV required action under BOD 26-04 (patch within the required window or discontinue use if mitigations are unavailable). Until patched, restrict network exposure of Windchill/FlexPLM servers and hunt for signs of exploitation or ransomware precursor activity; the available data does not list specific patched versions, so defer to PTC's advisory.
Affected
PTC Windchill
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PTC FlexPLM
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Estimated exposure
moderatelikely on the order of thousands of enterprise deployments (a few thousand Windchill/FlexPLM servers, with only a subset internet-exposed) — Windchill and FlexPLM are enterprise PLM products deployed inside large manufacturing and retail organizations rather than consumer-scale software, and public internet scans typically surface only on the order of thousands of exposed PLM…
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description
A critical remote code execution (RCE) vulnerability has been reported in PTC Windchill PDMlink and PTC FlexPLM. The vulnerability may be exploited through the deserialization of untrusted data. * This advisory also applies to all CPS versions * The identified vulnerability also impacts Windchill and FlexPLM releases prior to 11.0 M030
CISA Known Exploited Vulnerability
Affected
PTC Windchill and FlexPLM
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Cl0p claims over 40 organizations including Shell and Philips were breached by exploiting critical RCE CVE-2026-12569 in PTC Windchill and FlexPLM.
Cl0p claims more than 40 organizations were victimized via CVE-2026-12569 (CVSS 9.3), a critical deserialization-based remote code execution flaw in PTC Windchill PDMlink and FlexPLM, affecting releases prior to 11.0 M030; CISA added the flaw to its KEV catalog in June. ReliaQuest found the group deployed a custom web shell that maps vault data, decrypts all credentials in the Windchill keystore, and includes a Java class loader enabling arbitrary code execution, lateral movement, persistence, and large-scale data exfiltration without extra tooling. Named victims include Shell, Philips, Fiserv, Zebra Technologies, Ingersoll Rand, Toast, Mindray, and Apple lens supplier Largan Precision, with stolen data ranging from one gigabyte to multiple terabytes per target. The campaign mirrors Cl0p's earlier mass-exploitation extortion operations against MOVEit, Cleo, GoAnywhere, and Oracle E-Business Suite.
Clop mass-exploited CVE-2026-12569 in PTC Windchill and FlexPLM in early June, claiming data theft from dozens of large organizations.
Clop began sending extortion emails in mid-July after exploiting CVE-2026-12569 in PTC Windchill and FlexPLM, likely as a zero-day in early June before PTC's June 17 disclosure and patch. Confirmed victims include Toast and Zebra, while GE, Philips and Shell are among claimed victims. CISA added the flaw, which allows unauthenticated remote code execution, to its KEV catalog on June 25. ReliaQuest said the group used a custom Windchill-specific web shell for credential theft and large-scale exfiltration, echoing its past MOVEit and Oracle E-Business Suite mass-exploitation campaigns.
ReliaQuest details a bespoke JSP web shell that Clop deploys on hacked PTC Windchill and FlexPLM servers after exploiting CVE-2026-12569.
ReliaQuest analyzed a custom Java web shell planted on vulnerable PTC Windchill and FlexPLM servers following exploitation of CVE-2026-12569 (CVSS 9.3). The implant decrypts Windchill keystore credentials including the LDAP manager password, enumerates the file vault for engineering data, and loads attacker-supplied Java classes in memory for post-exploitation. Commands let operators read and delete files, exfiltrate results, and deliver follow-on payloads such as ransomware. Ransom-ISAC, eCrime.ch and Defused previously attributed the campaign to the Clop data-theft extortion group.