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CVE-2026-12569

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in PTC Windchill and FlexPLM. For every flaw being used in attacks, see Exploited flaws.

CVE-2026-12569 is a security flaw in PTC Windchill and FlexPLM. Attackers can run their own code on PTC Windchill and FlexPLM from anywhere, without logging in. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 25 Jun 2026, and says ransomware gangs have used it.[1]

PTC Windchill and FlexPLM is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. PTC has published a fix or advice.

Description

CISA calls it an improper input validation in PTC Windchill and FlexPLM. In its words: “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.”[1]

The CVE record adds: “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”[2]

The underlying weakness is improper input validation (CWE-20), deserialization of untrusted data (CWE-502), in MITRE’s list of common software weaknesses.

It scores 9.8 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; PTC’s advisory has them[3]. CISA names the product as PTC Windchill and FlexPLM.

Most families won’t have PTC Windchill and FlexPLM; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 25 Jun 2026, 7 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 28 Jun 2026 to fix it.[1] CISA says ransomware gangs have used it.

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 46%. That’s in the top 2% of the flaws it scores.[4]

CISA assesses it as automatable: attackers can run it against many targets at once.

CISA doesn’t say who was attacked, or how.

Fix

PTC has published a fix or advice.[3] CISA’s 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).”[1]

  1. Check whether you use it.PTC Windchill and FlexPLM is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 28 Jun 2026 to fix it.
  3. If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.

You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 9.8.[2]
CISA adds it to its catalog of flaws known to be used in attacks, noting that ransomware gangs have used it.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 46%.[4]

See also

Other improper input validation flaws

  • CVE-2026-93952, Arista VeloCloud Orchestrator: improper input validation ·
  • CVE-2019-1068, Microsoft SQL Server: remote code execution ·
  • CVE-2026-34910, Ubiquiti UniFi OS: improper input validation ·
  • CVE-2026-6973, Ivanti Endpoint Manager Mobile (EPMM): improper input validation ·
  • CVE-2026-34197, Apache ActiveMQ: improper input validation ·

Added the same day

  • CVE-2026-20230, Cisco Unified Communications Manager: server-side request forgery (SSRF) ·

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “PTC Windchill and FlexPLM Improper Input Validation Vulnerability”. Known Exploited Vulnerabilities Catalog, added 25 Jun 2026.
  2. ^ National Institute of Standards and Technology. “CVE-2026-12569 Detail”. National Vulnerability Database, published 18 Jun 2026.
  3. ^ PTC. Advisories and fixes: ptc.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.460, percentile 98.8, 31 Oct 2026.
  5. CVE Program. “CVE-2026-12569”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.