CVE-2026-76476: Cisco Unified Communications Products Hardening Release: October 2026 - Improper Input Validation Vulnerabilities
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.
Affected Software
Event History
Frequently Asked Questions
What does an attacker need to exploit this issue?
The CVSS vector indicates that exploitation is possible over the network, requires low attack complexity and low privileges, and does not require user interaction.
What could a successful exploit allow?
The issue is rated high severity with high impacts to confidentiality, integrity, and availability. The CVSS vector indicates the impact remains within the affected security authority.
Which environments should be assessed first?
Assess deployments of Cisco Emergency Responder, Prime Collaboration Deployment, Unified Communications Manager, Unified CM IM & Presence Service, Unified CM Session Management Edition, and Unity Connection. The provided information does not identify affected software versions or configuration prerequisites.
Are temporary mitigations available if updates cannot be applied immediately?
No specific workaround or mitigation is provided in the available information. It states that software hardening releases address the vulnerabilities.