CVE-2026-20178 Open redirect in Cisco Webex App
An attacker can redirect users to malicious websites via crafted URLs in the Cisco Webex App browser interface.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-20178?
CVE-2026-20178 is a medium-severity vulnerability in Cisco Webex App, published on 17 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A vulnerability in the browser-based version of Cisco Webex App could have allowed an unauthenticated, remote attacker to redirect users to a malicious webpage. Cisco has addressed this vulnerability in the Cisco Webex App, and no customer action is needed. This vulnerability existed due to improper input validation of URL parameters in an HTTP request. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to click a crafted URL. A successful exploit could have allowed the attacker to redirect a user to a malicious website.
Weakness: CWE-601
Which versions are affected by CVE-2026-20178?
It affects 1 product.
Products include Cisco Webex Web App.
How do I fix CVE-2026-20178?
No fix has been published for CVE-2026-20178 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20178 being exploited?
There is no known exploitation of CVE-2026-20178 in the wild and no public exploit code.
Sources
Also known as GHSA-5m7h-7whv-78fw.