CISA Adds Exploited PTC Windchill RCE Flaw to KEV as Web Shell Attacks Continue

Summary

CISA has added CVE-2026-12569, a critical remote code execution vulnerability in PTC Windchill PDMlink and FlexPLM (CVSS 9.3), to its Known Exploited Vulnerabilities catalog following evidence of active exploitation. Attackers are leveraging improper input validation and untrusted data deserialization to deploy JSP web shells on vulnerable systems. PTC has confirmed continued heightened threat activity and provided multiple indicators of compromise and mitigation strategies.

Full text

CISA Adds Exploited PTC Windchill RCE Flaw to KEV as Web Shell Attacks Continue Ravie LakshmananJun 26, 2026Vulnerability / Software Security The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added a critical remote code execution vulnerability impacting PTC Windchill PDMlink and PTC FlexPLM enterprise Product Data Management (PDM) and Product Lifecycle Management (PLM) software to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerability in question is CVE-2026-12569 (CVSS score: 9.3), a case of improper input validation that could allow an attacker to execute arbitrary code by sending a malicious request to the network. "The vulnerability is a remote code execution (RCE) issue that may be exploited through deserialization of untrusted data," according to an advisory released by PTC. Although patches for the flaw were released last week, PTC has since confirmed, as of June 25, that "we've received continued reports of heightened threat activity," with the company disclosing that unknown attackers are exploiting the vulnerability to deploy JSP web shells against susceptible systems. PTC has also released the following indicators of compromise (IoCs) associated with the activity - 172.111.38.31 216.152.148.54 104.243.35.131 74.50.76.146 5.180.41.35 216.152.148.54 5.180.41.35 (Attacker command-and-control address) Web shell files following the naming pattern /Windchill/login/[0-9a-f]{16}.jsp As mitigations, users are advised to perform the following actions - Block 5.180.41.35 at the perimeter firewall immediately Search HTTP access logs for any POST requests to /Windchill/login/*.jsp Scan the filesystem for JSP files matching the 16-hex-char pattern /Windchill/login/[0-9a-f]{16}.jsp Hash-check any suspicious JSP files against 55a1eb4c2d3da04376df39d7ba832569c6af1a37a0cf2b95f754ac898023a30c Check for flst.txt in /tmp or the Windchill working directory, the presence of which confirms attacker file-listing activity Add WAF / IDS rule blocking any request containing the header X-windchill-req: Restrict internet exposure of the Windchill login endpoint where operationally possible The development makes it the first-ever PTC product vulnerability added to CISA's KEV catalog, not to mention highlighting how threat actors are rapidly weaponizing newly disclosed vulnerabilities to their advantage. Found this article interesting? Follow us on Google News, Twitter and LinkedIn to read more exclusive content we post. SHARE     Tweet Share Share Share SHARE  CISA, Deserialization, remote code execution, Vulnerability, Web Shell ⚡ Top Stories This Week Chrome V8 Zero-Day CVE-2026-11645 Exploited in the Wild - Patch Now Researchers Build Self-Replicating AI Worm That Operates Entirely on Local, Open-Weight Models Microsoft Defender RoguePlanet Zero-Day Grants SYSTEM Access on Updated Windows Anthropic Releases Claude Fable 5, Its Most Powerful AI Yet, With Cyber Safeguards Microsoft Patches Record 206 Flaws, Including Three Zero-Days and Critical RCE Bugs Ivanti, Fortinet, and SAP Release Patches for Multiple Critical Vulnerabilities Cybersecurity Stars Awards 2026: Winners Announced Across 95 Categories ThreatsDay Bulletin: Worm Code Leaked, AI Agent Phished, Claude Code Patch + 28 New Stories New GreatXML Exploit Bypasses Windows BitLocker via Recovery Partition XML Files Agentjacking Attack Tricks AI Coding Agents Into Running Malicious Code China-Linked Hackers Backdoored Linux Login Software to Hide for Nearly a Decade Critical Splunk Enterprise Flaw Lets Attackers Run Code Without Authentication U.S. Orders Anthropic to Suspend Fable 5 and Mythos 5 Access for Foreign Nationals Over 400 Arch Linux AUR Packages Hijacked to Deploy Infostealer and eBPF Rootkit Palo Alto Warns of Active Exploitation of PAN-OS GlobalProtect VPN Flaw ⚡ Weekly Recap: Chrome 0-Day, UniFi Exploits, macOS Stealers, VPN Flaw and More ⭐ Featured Resources Get the 2026 Guide to Govern and Secure Enterprise AI Agents at Scale [Watch Demo] See Which Security Gaps Attackers Could Exploit First AI Can’t Stop Every Attack. Learn How Zero Trust Can Block What’s Unknown Have You Outgrown Your MDR? 7 Warning Signs Every CISO Should Check

Indicators of Compromise

• ip — 172.111.38.31
• ip — 216.152.148.54
• ip — 104.243.35.131
• ip — 74.50.76.146
• ip — 5.180.41.35
• cve — CVE-2026-12569
• malware — JSP web shell pattern /Windchill/login/[0-9a-f]{16}.jsp

Entities