CVE-2019-1866: Cisco Webex Business Suite Host Header Value Integrity Vulnerability

Severity: low (CVSS 3.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-13 · updated 2026-06-17
Weakness: CWE-284

Description

Cisco Webex Business Suite before 39.1.0 contains a vulnerability that could allow an unauthenticated, remote attacker to affect the integrity of the application. The vulnerability is due to improper validation of host header values. An attacker with a privileged network position, either a man-in-the-middle or by intercepting wireless network traffic, could exploit this vulnerability to manipulate header values sent by a client to the affected application. The attacker could cause the application to use input from the header to redirect a user from the Cisco Webex Meetings Online site to an arbitrary site of the attacker's choosing.

Affected products

Cisco Webex Business Suite: before 39.1.0 — fixed in 39.1.0

How to fix

Upgrade to a fixed version: Cisco Webex Business Suite 39.1.0. Check the vendor advisory for mitigations.

References

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