CVE-2026-20059
CVE-2026-20059 is a medium-severity vulnerability in Cisco Unity Connection with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- EPSS exploit prediction: 0% (9th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-22951
- Weakness: CWE-79
- Affected product: Cisco Unity Connection
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-20059?
- 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.
- How severe is CVE-2026-20059?
- CVE-2026-20059 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-20059 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-20059?
- CVE-2026-20059 primarily affects Cisco Unity Connection. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-20059?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-20059 have an EU (EUVD) identifier?
- Yes. CVE-2026-20059 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22951.
- When was CVE-2026-20059 published?
- CVE-2026-20059 was published on 2026-04-15 and last updated on 2026-06-17.
References
Affected products (12)
- cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:14.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:14su1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:14su2:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:14su3:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:14su3a:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:14su4:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:14su5:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:15.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:15su1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:15su2:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unity_connection:15su3:*:*:*:*:*:*:*
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