CVE-2020-3345: Cisco Webex Meetings and Cisco Webex Meetings Server HTML Injection Vulnerability

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-16 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability in certain web pages of Cisco Webex Meetings and Cisco Webex Meetings Server could allow an unauthenticated, remote attacker to modify a web page in the context of a browser. The vulnerability is due to improper checks on parameter values within affected pages. An attacker could exploit this vulnerability by persuading a user to follow a crafted link that is designed to pass HTML code into an affected parameter. A successful exploit could allow the attacker to alter the contents of a web page to redirect the user to potentially malicious web sites, or the attacker could leverage this vulnerability to conduct further client-side attacks.

Affected products

Cisco Webex Meetings: before 40.6.0 — fixed in 40.6.0
Cisco WebEx Meetings Server: through 4.0; 4.0, 4.0-maintenance_release1, 4.0-maintenance_release2

How to fix

Upgrade to a fixed version: Cisco Webex Meetings 40.6.0. Check the vendor advisory for mitigations.

References

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