CVE-2026-20230Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability
Updated under an hour ago ()
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It affects Cisco Unified Communications Manager. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jun 25, 2026; federal agencies had to remediate by Jun 28, 2026. Treat that date as your deadline.
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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
- 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
- Weakness (CWE)
- CWE-918
- Known exploited
- Added to CISA KEV Jun 25, 2026; federal remediation due Jun 28, 2026Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- EPSS (exploitation in the next 30 days)
- 88.20% (percentile 100)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco Cisco Unified Communications Manager cisco:unified_communications_manager (from the name) | 14; 14SU1; 14SU2; 14SU3; 15; 15SU1; 14SU4; 14SU4a; and 14 more ranges | CNA record |
cisco unified_communications_manager cisco:unified_communications_manager | from 14.0 before 14su6; from 14.0 before 14su6; from 15.0 through 15su4a; from 15.0 through 15su4a | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssrf-cXPnHcWvendor-advisory
- https://denizhalil.com/2026/06/12/cve-2026-20230-cisco-unified-cm-ssrf/exploit, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20230us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.