Cisco Unified Communications Products Hardening Release: October 2026 - Improper Input Validation Vulnerabilities

Summary

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-2026-76476 are related to issues concerning improper input validation that are grouped under the Common Weakness Enumeration (CWE) Class CWE-20.

Timeline

1. Oct 21, 2026, 12:00 AM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

2. Oct 21, 2026, 4:15 PM UTCCVE published
3. Oct 22, 2026, 7:05 AM UTCFirst seen by cve.now
4. Oct 22, 2026, 11:04 PM UTCRecord last updated

Affected versions

• Cisco Cisco Emergency Responder

  14, 14SU1, 14SU2, 14SU3, 14SU3a, 15, 15SU1, 15SU1a, 14SU4, 15SU2, 15SU3, 14SU5, 15SU4, 14SU6

• 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, 14SU6

• Cisco Cisco Unified Communications Manager IM and Presence Service

  14, 14SU1, 14SU2, 14SU2a, 14SU3, 15, 15SU1, 14SU4, 15SU2, 15SU3, 14SU5, 15SU4, 14SU6

• Cisco Cisco Unity Connection

  14, 14SU1, 14SU2, 14SU3, 14SU3a, 15, 15SU1, 14SU4, 15SU2, 15SU3, 14SU5, 15SU4, 14SU6

References 1