What is CVE-2023-20104?

CVE-2023-20104 is a medium-severity vulnerability in Cisco Webex Teams, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-03-03.

How severe is CVE-2023-20104?

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

XSS in Cisco Webex Teams

CVE-2023-20104

A vulnerability in the file upload functionality of Cisco Webex App for Web could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending an arbitrary file to a user and persuading that user to browse to a specific URL. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-03-03 · last modified 2026-06-17.

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: 0.005 (40.1th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-20104?: CVE-2023-20104 is a medium-severity vulnerability in Cisco Webex Teams, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-03-03.
How severe is CVE-2023-20104?: Medium severity. CVSS v3 base score is 6.1 out of 10.