TI-2026-16423 Aliases CVE-2026-20230 GHSA-fcv7-pchj-75c2

Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability

CRITICAL 96Exploited in the wildCWE-918Published 2026-06-03 · Updated 2026-10-07

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2026-06-25CISA due date 2026-06-28

EPSS 0.88528 99th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	Cisco Unified Communications Manager	14; 14SU1; 14SU2; 14SU3; 15; 15SU1; 14SU4; 14SU4a; 15SU1a; 15SU2; 15.0.1.13010-1; 15.0.1.13011-1; 15.0.1.13012-1; 15.0.1.13013-1; 15.0.1.13014-1; 15.0.1.13015-1; 15.0.1.13016-1; 15.0.1.13017-1; 15SU3a; 14SU5; 15SU4; 15SU4a	—	No fix listed	CNA

Cisco Unified Communications Manager VendorCisco Affected 14; 14SU1; 14SU2; 14SU3; 15; 15SU1; 14SU4; 14SU4a; 15SU1a; 15SU2; 15.0.1.13010-1; 15.0.1.13011-1; 15.0.1.13012-1; 15.0.1.13013-1; 15.0.1.13014-1; 15.0.1.13015-1; 15.0.1.13016-1; 15.0.1.13017-1; 15SU3a; 14SU5; 15SU4; 15SU4a Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:unified_communications_manager:::::-:::*	14.0 to before 14su6	Vulnerable	Cisco
cpe:2.3:a:cisco:unified_communications_manager:::::session_management:::*	14.0 to before 14su6	Vulnerable	Cisco
cpe:2.3:a:cisco:unified_communications_manager:::::-:::*	15.0 – 15su4a	Vulnerable	Cisco
cpe:2.3:a:cisco:unified_communications_manager:::::session_management:::*	15.0 – 15su4a	Vulnerable	Cisco

cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:* Versions 14.0 to before 14su6 Vulnerable ·Cisco
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:* Versions 14.0 to before 14su6 Vulnerable ·Cisco
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:* Versions 15.0 – 15su4a Vulnerable ·Cisco
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:* Versions 15.0 – 15su4a Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-06-25 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2026-20230
2026-10-03 Alias added: GHSA-fcv7-pchj-75c2
2026-10-07 CISA SSVC decision points changed

References

Exploit 1

https://denizhalil.com/2026/06/12/cve-2026-20230-cisco-unified-cm-ssrf/

Advisory 1

cisco-sa-cucm-ssrf-cXPnHcW

TI-2026-16259 Cisco Unified Communications Products Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
TI-2008-00019 Heap-based buffer overflow in the Certificate Trust List (CTL) Provider service… CVSS 2.0HIGH 10.0
TI-2013-05779 The TFTP service in Cisco Unified Communications Manager (aka CUCM or Unified CM) allows… CVSS 3.1HIGH 7.3
TI-2011-02932 Directory traversal vulnerability in Cisco Unified Communications Manager (CUCM) 5.x and… CVSS 2.0HIGH 7.8
TI-2011-01424 SQL injection vulnerability in Cisco Unified Communications Manager (aka CUCM, formerly… CVSS 2.0HIGH 8.5

See all 238 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences