CVE-2026-12569: PTC Windchill and FlexPLM Improper Input Validation Vulnerability

In short

PTC Windchill and FlexPLM has a weakness classified as improper input validation (CWE-20). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-06-25. NVD lists CVSS 4.0 at 9.3 CRITICAL. CISA reports known ransomware campaign use.

What it is

“PTC Windchill and FlexPLM contains an improper input validation vulnerability allowing an unauthenticated, remote attacker to execute arbitrary code by sending a malicious request to the network.” — CISA KEV, retrieved 2026-11-01

“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” — NVD, retrieved 2026-11-01

Who is affected

PTC Windchill and FlexPLM. NVD lists the following versions as affected:

• Ptc Flexplm: through 11.0m030
• Ptc Flexplm: version 11.1m020
• Ptc Flexplm: version 11.2.1.0
• Ptc Flexplm: version 12.0.0.0
• Ptc Flexplm: version 12.0.2.0
• Ptc Flexplm: version 12.1.3.0
• Ptc Flexplm: version 13.0.2.0
• Ptc Flexplm: version 13.0.3.0
• Ptc Windchill Pdmlink: before 11.0m030
• Ptc Windchill Pdmlink: version 11.0m030
• Ptc Windchill Pdmlink: version 11.1m020
• Ptc Windchill Pdmlink: version 11.2.1.0
• Ptc Windchill Pdmlink: version 12.0.2.0
• Ptc Windchill Pdmlink: version 12.1.2.0
• Ptc Windchill Pdmlink: version 13.0.2.0
• Ptc Windchill Pdmlink: version 13.1.0.0
• Ptc Windchill Pdmlink: version 13.1.1.0
• Ptc Windchill Pdmlink: version 13.1.2.0
• Ptc Windchill Pdmlink: version 13.1.3.0

Exploitation status

CISA KEV added: 2026-06-25. Known ransomware campaign use: Known (reported by CISA). Due date CISA set for US federal civilian agencies: 2026-06-28.

Scores

NVD CVSS 4.0: 9.3 CRITICAL; vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:C/RE:X/U:Red; source 0b655efc-079c-4cb9-9e8d-164871239f4e.

EPSS by FIRST: 46.05%; percentile 98.81; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-20, CWE-502.

Timeline

CISA 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.” — CISA KEV

What to do

• Confirm whether you run PTC Windchill and FlexPLM and which version.
• Apply the vendor update or mitigation in the vendor advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.