[NEW] [high] PTC Windchill and FlexPLM: Multiple vulnerabilities

highCVE-2026-77644 CVE-2026-77645 CVE-2026-77646

A remote anonymous attacker can exploit multiple vulnerabilities in PTC Windchill and PTC FlexPLM to bypass security measures, execute arbitrary code, and disclose confidential data.

CSIRTS triage

vendor: PTC Authentication bypass Remote code execution Information disclosure

What: Multiple vulnerabilities in PTC Windchill and FlexPLM allow remote anonymous attackers to bypass security, execute arbitrary code, and disclose confidential data.
Who is affected: PTC Windchill and FlexPLM deployments accessible to anonymous attackers.
Urgency: High: severity rated high; remote code execution and authentication bypass are critical.
Action: Contact PTC for security updates for Windchill and FlexPLM and apply patches immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-21
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2963

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-776440.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-776450.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-776460.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-77644	coverage & exploitation status	NVD · CVE.org
CVE-2026-77645	coverage & exploitation status	NVD · CVE.org
CVE-2026-77646	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for PTC Windchill and FlexPLM

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-77646: A Server-Side Request Forgery (SSRF) vulnerability has been reported in PTC Windchill PDMLink …nvd · 2026-08-20
unknownCVE-2026-77645: A critical remote code execution (RCE) vulnerability has been reported in PTC Windchill and PT…nvd · 2026-08-20
criticalexploitedCVE-2026-12569: PTC Windchill and FlexPLM Improper Input Validation Vulnerabilitycisa-kev · 2026-06-25