CVE-2026-77646: ptc flexplm Deserialization of Untrusted Data
CVSS: 7.7v4.0HighDeferred
Published 20-08-2026Last modified 21-08-2026
Vulnerability summary
CVE-2026-77646 is a high (CVSS 7.7) Deserialization of Untrusted Data vulnerability in ptc flexplm. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.9% of scored vulnerabilities.
CVSS score
7.7/10
010
High · v4.0 (CVE.org)EPSS score
0.44%
0%100%
Low · +0.09 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 20-08-2026PublishedVulnerability first disclosed.
- 21-08-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.7Preferred score · CVE.org (CNA)
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:RedSourcesAll 2 agree
- NVDNIST7.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:D/RE:M/U:Red
EPSS trend
Probability
0.44%
Chance of exploitation in the next 30 days
Percentile
37%
Versus all other CVEs
30-day change
+0.09 pp
From 0.35% on 21-09-2026
21-09-202621-10-2026
EPSS score0.44%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
- CWE-918Server-Side Request Forgery (SSRF)The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Affected systems
Ptc2 products
- flexplm11.0 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 | 13.0.3.0
- windchill_pdmlink11.0 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 | 13.1.3.0
1 vendor · 2 products