CVE-2020-3542: Cisco Webex Training Unauthorized Meeting Join Vulnerability

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-09-04 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability in Cisco Webex Training could allow an authenticated, remote attacker to join a password-protected meeting without providing the meeting password. The vulnerability is due to improper validation of input to API requests that are a part of meeting join flow. An attacker could exploit this vulnerability by sending an API request to the application, which would return a URL that includes a meeting join page that is prepopulated with the meeting username and password. A successful exploit could allow the attacker to join the password-protected meeting. The attacker would be visible in the attendee list of the meeting.

Affected products

Cisco Webex Training: before 40.7.6 — fixed in 40.7.6

How to fix

Upgrade to a fixed version: Cisco Webex Training 40.7.6. Check the vendor advisory for mitigations.

References

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