CVE-2026-20230

As of 2026-06-26, CVE-2026-20230 is a CVSS 8.6 (HIGH-severity) vulnerability. CISA KEV-listed (known exploited); Public exploit code available. EPSS exploitation probability 41.7%. Threadlinqs Intelligence tracks 9 threats exploiting it.

Last updated: 2026-06-26

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 elevate to root. Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root. Note: To exploit this vulnerability, the WebDialer service must be enabled. WebDialer is disabled by default.

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Weaknesses (CWE)

CWE-918

Exploitation status

CISA KEV-listed (known exploited) · public exploit code available

• HORKimhab/CVE-2026-20230 (github)
• HalilDeniz/CVE-2026-20230-Scanner (github)
• W5M1n9/Cisco-Unified-Communications-Manager-Server-Side-Forgery-Request-Vulnerability-CVE-2026-20230 (github)

Threats tracking this CVE

• Cisco Unified CM / Unified CM SME SSRF Vulnerability (CVE-2026-20230) — WebDialer File-Write to Root, Actively Exploited, Added to CISA KEV — CRITICAL
• CVE-2026-20230: Cisco Unified Communications Manager WebDialer SSRF Actively Exploited to Drop Tor-Routed JSP Webshells via Rogue Apache Axis Service, CISA Sets June 28 Deadline — CRITICAL
• CISA BOD 26-04: Risk-Based Vulnerability Remediation and CISO Reporting Mandate for FCEB Agencies — MEDIUM
• CVE-2026-20230: Active Exploitation of Cisco Unified CM WebDialer SSRF Flaw Leading to Root-Level Compromise — HIGH
• Active Exploitation of Cisco Unified Communications Manager WebDialer SSRF (CVE-2026-20230) and Catalyst SD-WAN Manager Root Privilege-Escalation Zero-Day (CVE-2026-20245) — CRITICAL
• CISA KEV: PTC Windchill RCE and Cisco Unified CM SSRF - Critical Remote Code Execution Vulnerabilities — CRITICAL
• CISA KEV: Cisco Unified Communications Manager SSRF to Webshell (CVE-2026-20230) Actively Exploited — CRITICAL
• CISA KEV Adds CVE-2026-12569 (PTC Windchill/FlexPLM Unauthenticated RCE via Deserialization) and CVE-2026-20230 (Cisco Unified CM WebDialer SSRF to Root) — CRITICAL
• Cisco Unified CM WebDialer SSRF (CVE-2026-20230) — Unauthenticated SSRF Chained to Arbitrary File Write Enabling Root Compromise; Public PoC Available — CRITICAL

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssrf-cXPnHcW

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.