What is CVE-2019-18355?

CVE-2019-18355 is a critical-severity vulnerability in Thycotic Secret Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2019-10-23.

How severe is CVE-2019-18355?

Critical severity. CVSS v3 base score is 9.8 out of 10.

SSRF in Thycotic Secret Server

CVE-2019-18355

An SSRF issue was discovered in the legacy Web launcher in Thycotic Secret Server before 10.7.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2019-10-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Thycotic Secret Server

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

thycotic.force.com/support/s/article/SS-RN-EXT-Secret-Server-10-7-000000-Legacy… (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2019-18355?: CVE-2019-18355 is a critical-severity vulnerability in Thycotic Secret Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2019-10-23.
How severe is CVE-2019-18355?: Critical severity. CVSS v3 base score is 9.8 out of 10.