CVE-2026-76475 in Emergency Responder
Summary
by MITRE • 10/22/2026
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-2026-76475 are related to issues concerning improper neutralization of input during web page generation that are grouped under the Common Weakness Enumeration (CWE) Base CWE-79.
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Analysis
by VulDB Data Team • 10/22/2026
Cisco has released software hardening updates for a suite of Unified Communications and collaboration products, including Cisco Emergency Responder, Cisco Prime Collaboration Deployment, Cisco Unified Communications Manager, its IM & Presence Service, Session Management Edition, and Unity Connection. These releases address multiple internally discovered vulnerabilities identified through rigorous internal security reviews aimed at enhancing product quality and proactive defense postures. The specific vulnerability tracked under CVE-2026-76475 falls within the category of improper neutralization of input during web page generation, a flaw formally classified under Common Weakness Enumeration identifier CWE-79, commonly known as Cross-Site Scripting or XSS.
The technical nature of this weakness involves insufficient validation and sanitization of user-supplied data before it is processed by the application's backend logic and subsequently rendered in HTML responses sent to client browsers. When an attacker injects malicious scripts into input fields that are reflected or stored without proper encoding, these scripts execute within the context of the victim’s browser session. This execution occurs under the trust relationship established between the user and the web server hosting the affected Cisco services. The flaw represents a fundamental breakdown in input handling protocols where special characters such as angle brackets, quotes, and ampersands are not adequately escaped or filtered prior to inclusion in dynamic content generation processes.
From an operational perspective, successful exploitation of this vulnerability allows attackers to execute arbitrary JavaScript code within the context of the affected application’s domain. This capability can lead to severe security implications including session hijacking through theft of authentication cookies, credential harvesting via phishing overlays injected into legitimate login pages, and defacement of user interfaces. In enterprise environments utilizing these Unified Communications platforms, such exploitation could facilitate lateral movement if attackers leverage stolen credentials or tokens to access other internal systems. The impact is particularly critical given the sensitive nature of communication data managed by Cisco Unity Connection and IM & Presence services, where confidentiality and integrity are paramount for organizational security compliance.
Mitigation strategies primarily involve applying the provided software hardening releases immediately upon availability. Administrators should verify that all instances of Unified Communications Manager, Prime Collaboration Deployment, Emergency Responder, and related components are updated to the patched versions specified in Cisco’s official advisory documentation. In addition to patching, organizations should implement defense-in-depth measures such as deploying Web Application Firewalls configured with rulesets capable of detecting and blocking common XSS payloads like script tags and event handlers. Enforcing strict Content Security Policy headers can further restrict the execution context of scripts, limiting damage even if an injection attempt succeeds. Regular security audits focusing on input validation practices across all web-facing interfaces within the UC environment are recommended to prevent recurrence of similar CWE-79 flaws in future development cycles.