Detect CVE-2026-12569 - PTC Windchill and FlexPLM Improper Input Validation / Unsafe Deserialization in IBM QRadar
Detects exploitation attempts targeting CVE-2026-12569, an improper input validation and unsafe deserialization vulnerability (CWE-20, CWE-502) in PTC Windchill and FlexPLM. This vulnerability is listed in CISA KEV, indicating active exploitation in the wild. Attackers may leverage this to achieve remote code execution via crafted serialized objects or malformed input submitted to Windchill/FlexPLM HTTP endpoints.
MITRE ATT&CK
QRadar Detection Query
SELECT
DATEFORMAT(starttime, 'YYYY-MM-dd HH:mm:ss') AS event_time,
sourceip,
destinationip,
destinationport,
URL,
username,
QIDNAME(qid) AS event_name,
logsourcename(logsourceid) AS log_source,
magnitude
FROM events
WHERE
LOGSOURCETYPENAME(logsourceid) IN ('Microsoft IIS', 'Apache HTTP Server', 'Nginx', 'Linux OS')
AND (
URL ILIKE '%/Windchill/%'
OR URL ILIKE '%/FlexPLM/%'
OR URL ILIKE '%/wt.httpgw%'
OR URL ILIKE '%rO0AB%'
OR URL ILIKE '%aced0005%'
OR URL ILIKE '%ObjectInputStream%'
OR "Process Name" ILIKE '%cmd.exe%'
OR "Process Name" ILIKE '%powershell%'
OR "Process Name" ILIKE '%wget%'
OR "Process Name" ILIKE '%curl%'
)
AND LAST 7 DAYS
ORDER BY starttime DESC
LIMIT 1000QRadar AQL query identifying HTTP access to PTC Windchill and FlexPLM endpoints, focusing on URLs containing Java deserialization markers or post-exploitation tool invocations on application servers.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate administrative access to Windchill via URLs that happen to contain encoded parameters
- Security scanners performing routine checks on PTC product endpoints
- Authorized maintenance scripts running on Windchill application servers
- Misconfigured monitoring tools generating alerts for benign serialization activity
Other platforms for CVE-2026-12569
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1CVE-2026-12569 - Simulated Java Deserialization Payload HTTP Request to Windchill Endpoint
Expected signal: Proxy or WAF logs should capture the POST request to /Windchill/servlet/WindchillAuthenticator with raw body containing aced0005 (Java serialization magic bytes). Network capture (Wireshark/tcpdump) will show the octets 0xAC 0xED 0x00 0x05 in the TCP stream.
- Test 2CVE-2026-12569 - Simulate Post-Exploitation Shell Spawn from Java Parent (Windows)
Expected signal: Windows Security Event ID 4688 (Process Creation) showing cmd.exe with parent process java.exe. EDR (CrowdStrike/Defender) ProcessRollup2 event with ParentBaseFileName=java.exe and FileName=cmd.exe.
- Test 3CVE-2026-12569 - Simulate Post-Exploitation Outbound C2 from Windchill Server (Linux)
Expected signal: Network connection logs (Elastic/Zeek/firewall) showing outbound TCP connection from Windchill server to external IP on port 4444. Process ancestry in EDR showing bash/curl invoked with suspicious URL parameters (hostname, whoami output).
References (4)
- https://www.ptc.com/en/support/article/CS473270
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-12569
Unlock Pro Content
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