Critical severity · published Oct 21, 2026
CVE-2026-76474
Cisco Unified Communications Products Hardening Release: October 2026 - Improper Authentication Vulnerabilities
New
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
As part of Cisco's ongoing commitment to proactive security and product quality, engineering teams for Cisco Emergency Responder, Cisco Prime Collaboration Deployment, Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), and Cisco Unity Connection have conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-76474 are related to issues concerning improper authentication that are grouped under the Common Weakness Enumeration (CWE) Class CWE-287.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CE
Cisco Emergency Responder · Cisco
14; 14SU1; 14SU2; 14SU3; 14SU3a; 15; +8 more · source: vendor
CU
Cisco Unified Communications Manager · Cisco
14; 14SU1; 14SU2; 14SU3; 15; 15SU1; +17 more · source: vendor
CU
Cisco Unified Communications Manager IM and Presence Service · Cisco
14; 14SU1; 14SU2; 14SU2a; 14SU3; 15; +7 more · source: vendor
CU
Cisco Unity Connection · Cisco
14; 14SU1; 14SU2; 14SU3; 14SU3a; 15; +7 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-76474
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-76474
sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-hardening-twgbH9e3
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