What is CVE-2026-20233?

CVE-2026-20233 is a medium-severity vulnerability in Cisco Webex Meetings, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-03.

How severe is CVE-2026-20233?

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

XSS in Cisco Webex Meetings

CVE-2026-20233

A vulnerability in the web-based user interface of Cisco Webex Meetings could have allowed an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack. Cisco has addressed this vulnerability in the Webex Meetings ser…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (5.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Cisco Webex Meetings — versions 39.7.7, 39.9, 40.4.10

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

psirt@cisco.com

Frequently asked questions

What is CVE-2026-20233?: CVE-2026-20233 is a medium-severity vulnerability in Cisco Webex Meetings, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-03.
How severe is CVE-2026-20233?: Medium severity. CVSS v3 base score is 6.1 out of 10.