What is CVE-2026-77646?
A Server-Side Request Forgery (SSRF) vulnerability has been reported in PTC Windchill PDMLink and PTC FlexPLM. The vulnerability may be exploited through the deserialization of untrusted data.
The record classifies CVE-2026-77646 under weakness classes CWE-502, CWE-918. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 46 days ago.
Severity and exploitation probability
- CVSS v4.0 base score
- 7.7 — High (derived from score)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/AU:Y/R:U/V:D/RE:M/U:Red - EPSS (FIRST)
- 0.3% probability of exploitation in the next 30 days, higher than 28.1% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-08-20, last modified 2026-08-21
Is CVE-2026-77646 being exploited?
It currently carries a trending score of 37 in the Threadlinqs vulnerability feed.
Affected products and versions
- PTC: Windchill PDMLink, FlexPLM
How to fix CVE-2026-77646
No vendor patch reference has been recorded for CVE-2026-77646 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-77646
No threat campaign in the Threadlinqs corpus currently references CVE-2026-77646, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.
Sources
Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.