CVE-2026-20059

Name: CVE-2026-20059
Creator: NVD / NIST
Published: 2026-04-15T17:17:01.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2026-20059 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.19%

9.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Cisco	Unity Connection	<= 12.5
Cisco	Unity Connection	14.0
Cisco	Unity Connection	14su1
Cisco	Unity Connection	14su2
Cisco	Unity Connection	14su3
Cisco	Unity Connection	14su3a
Cisco	Unity Connection	14su4
Cisco	Unity Connection	14su5
Cisco	Unity Connection	15.0
Cisco	Unity Connection	15su1
Cisco	Unity Connection	15su2
Cisco	Unity Connection	15su3

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-unity-vulns-n2EJSbbwVendor Advisory

Timeline

Published: Apr 15, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-20059?

How severe is CVE-2026-20059?

CVE-2026-20059 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2026-20059?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20059?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST