What is CVE-2020-8263?

CVE-2020-8263 is a medium-severity vulnerability in Pulsesecure Pulse Secure Desktop Client, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-10-28.

How severe is CVE-2020-8263?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Pulsesecure Pulse Secure Desktop Client

CVE-2020-8263

A vulnerability in the authenticated user web interface of Pulse Connect Secure < 9.1R9 could allow attackers to conduct Cross-Site Scripting (XSS) through the CGI file.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-10-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (50.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Pulsesecure Pulse Secure Desktop Client — versions 9.1
Pulse Connect Secure / Policy — versions 9.1R9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44601 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-8263?: CVE-2020-8263 is a medium-severity vulnerability in Pulsesecure Pulse Secure Desktop Client, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-10-28.
How severe is CVE-2020-8263?: Medium severity. CVSS v3 base score is 5.4 out of 10.