Critical

RCE in PTC Windchill PDMLink and FlexPLM via Deserialization of Untrusted Data

IdentifiersCVE-2026-4681CWE-94· Improper Control of Generation of…

CVE-2026-4681 is a critical remote code execution vulnerability affecting PTC Windchill PDMLink and PTC FlexPLM. According to the provided content, the flaw is exploitable through deserialization of untrusted data and has been described by PTC/CISA as a code injection issue mapped to CWE-94. The issue affects Windchill PDMLink versions 11.0 M030, 11.1 M020, 11.2.1.0, 12.0.2.0, 12.1.2.0, 13.0.2.0, 13.1.0.0, 13.1.1.0, 13.1.2.0, and 13.1.3.0, and FlexPLM versions 11.0 M030, 11.1 M020, 11.2.1.0, 12.0.0.0, 12.0.2.0, 12.0.3.0, 12.1.2.0, 12.1.3.0, 13.0.2.0, and 13.0.3.0. The supporting content also indicates all CPS releases before 11.0 M030 are susceptible. Observed exploitation-related indicators referenced by PTC and downstream detection content include suspicious requests to gateway or JSP paths using parameters such as run?c=, run?p=, .jsp?c=, and .jsp?p=, suggesting attackers may stage a gateway/JSP component and then use it to execute commands or read files.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can result in unauthenticated remote code execution on affected Windchill or FlexPLM systems. The provided content indicates attackers may execute arbitrary operating system commands, deploy staged gateway or JSP components, read local files, and potentially weaponize the server for follow-on activity. PTC-published indicators and related reporting also suggest post-exploitation outcomes may include persistent JSP webshell-style access, data theft, and ransomware-enabling intrusion activity. Given the CVSS 3.1 score of 10.0 and vector AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H, the impact is potentially complete compromise of confidentiality, integrity, and availability of the affected application environment.

Mitigation

If you can’t patch tonight, do this now.

Until full remediation is completed, implement PTC’s temporary HTTP-layer mitigations immediately. The provided content states PTC recommended Apache HTTP Server and Microsoft IIS workarounds to block vulnerable gateway-related paths, and to apply the same protections to File Server and Replica Server deployments. Minimize or eliminate internet exposure of affected systems, place them behind firewalls, isolate them from business networks where possible, and use secure remote access such as fully updated VPNs if remote administration is required. If mitigations cannot be applied quickly, disconnect publicly accessible Windchill/FlexPLM systems from the internet or temporarily shut down the affected services. Monitor for exploitation indicators including requests containing run?c=, run?p=, .jsp?c=, .jsp?p=, GW_READY_OK, suspicious Chrome user-agent activity, and filesystem artifacts identified by PTC.

Remediation

Patch, then assume compromise.

Apply vendor patches/hotfixes from PTC as soon as they are available for the affected Windchill PDMLink and FlexPLM versions. The provided content states PTC began releasing fixes and also published urgent mitigation guidance. Organizations should follow PTC product-specific remediation instructions for the affected versions, including any updated patched-version guidance from the vendor advisory. After patching, review systems for compromise using PTC’s indicators of compromise, including suspicious gateway/JSP artifacts, GW.class, payload.bin, dpr_<8 hex>.jsp files, and related suspicious class files and log indicators.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

PtcFlexplmapplication

PtcWindchill Pdmlinkapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

36 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

36 SOURCESView more in app

security weekNews

Jun 26, 2026

First-Ever Exploitation of PTC Windchill Vulnerability Discovered in the Wild - SecurityWeek

A different PTC Windchill vulnerability that authorities warned could face imminent exploitation, but the article states there are no reports of it being used in attacks.

splunk researchNews

Jun 14, 2026

Detection: PTC Windchill Gateway Command Execution | Splunk Security Content

A critical PTC Windchill/FlexPLM vulnerability associated with unauthenticated operating system command execution or file read via weaponized gateway or JSP components.

splunk researchNews

Jun 14, 2026

Detection: PTC Windchill GW READY OK Probe | Splunk Security Content

A critical exploitation path affecting PTC Windchill and FlexPLM, where attackers use the GW_READY_OK probe via the c= parameter to verify a staged gateway component is reachable before sending operating system commands.

splunk researchNews

Jun 14, 2026

Windchill | Splunk Security Content

A specific vulnerability identified as CVE-2026-4681 associated in the content with WindChill exploitation attack simulation data.

+7 more in the timeline

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence51

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity24

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-4681

NVD

nvd.nist.gov/vuln/detail/CVE-2026-4681

MITRE CWE · CWE-94

Improper Control of Generation of Code ('Code…

ptc.com

ptc.com/en/about/trust-center/advisory-center/active-advisories/windchill-flexplm-critical-vulnerability?srsltid=AfmBOop3e7Nthx5-BsrjKdpZi50wL6l6Bt21Fz0gUub2cIPgdPGV5bNl