CVE-2026-20059 Cisco Unity Connection Reflected Cross-Site Scripting Vulnerability
An unauthenticated attacker can execute arbitrary script code or access sensitive browser-based information by tricking a user into clicking a crafted link in the Cisco Unity Connection web 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-2026-20059?
CVE-2026-20059 is a medium-severity cross-site scripting vulnerability in Cisco Unity Connection, published on 15 Apr 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 web-based management interface of Cisco Unity Connection could allow an unauthenticated, remote attacker to conduct a reflected XSS attack against a user of the interface. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link. 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-20059?
It affects 1 product.
Products include Cisco Unity Connection.
How do I fix CVE-2026-20059?
No fix has been published for CVE-2026-20059 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-20059 being exploited?
There is no known exploitation of CVE-2026-20059 in the wild and no public exploit code.
Other vulnerabilities in Cisco Unity Connection
Sources
Also known as GHSA-83qv-c52p-jx5j.