What is CVE-2018-20807?

CVE-2018-20807 is a medium-severity vulnerability in Ivanti Connect Secure, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-06-28.

How severe is CVE-2018-20807?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Ivanti Connect Secure

CVE-2018-20807

An XSS issue has been found in welcome.cgi in Pulse Secure Pulse Connect Secure (PCS) 8.1.x before 8.1R12, 8.2.x before 8.2R9, and 8.3.x before 8.3R3 due to one of the URL parameters not being sanitized properly.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-06-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.016 (74.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Ivanti Connect Secure — versions 8.1, 8.2, 8.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730/ (Vendor Advisory)

Frequently asked questions

What is CVE-2018-20807?: CVE-2018-20807 is a medium-severity vulnerability in Ivanti Connect Secure, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-06-28.
How severe is CVE-2018-20807?: Medium severity. CVSS v3 base score is 6.1 out of 10.