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 service, and no customer action is needed. This vulnerability existed because of insufficient validation of user input. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. A successful exploit could have allowed the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (7.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Cisco Webex Meetings — versions 39.7.7, 39.9, 40.4.10
- Cisco Webex Meetings — versions 39.6.0, 39.7.0, 39.7.4
Weakness classification (CWE)
References
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.