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CVE-2026-20230

A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct server-side request forgery (SSRF) attacks through an affected device. This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to write files to the underlying operating system that could be used later to elevat…

Scores

8.6
CVSS 8.6 out of 10, high severity.
88.2%
EPSS 88.2% chance of exploitation in the next 30 days.

The facts

Published
3 June 2026
Last changed
7 October 2026
NVD status
Analyzed
Severity
High, CVSS 8.6 out of 10 (version 3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Weakness
Affects
  • cisco unified communications manager
Known exploited
Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 25 June 2026.
EPSS
88.2% chance of exploitation activity in the next 30 days (percentile 100).

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References