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CVE-2026-76476— Cisco Unified Communications Products Hardening Release: October 2026 - Improper Input Validation Vulnerabilities

Quick assessment

Affected
Cisco Cisco Emergency Responder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

作为思科持续致力于主动安全与产品品质的一部分，思科紧急响应器（Cisco Emergency Responder）、思科 Prime 协作部署（Cisco Prime Collaboration Deployment）、思科统一通信管理器（Unified CM）、思科统一通信管理器即时消息与 Presence 服务（Unified CM IM&P）、思科统一通信管理器会话管理版（Unified CM SME）以及思科 Unity Connection 的工程团队开展了一项全面的内部安全审查。该审查催生了多项软件加固

CVSS 8.8 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 63

VendorProduct Version RangeStatus
Cisco Cisco Emergency Responder 14 affected
14SU1 affected
14SU2 affected
14SU3 affected
14SU3a affected
15 affected
15SU1 affected
15SU1a affected
… +6 more rows
Cisco Cisco Unified Communications Manager 14 affected
14SU1 affected
14SU2 affected
14SU3 affected
15 affected
15SU1 affected
14SU4 affected
14SU4a affected
… +15 more rows
Cisco Cisco Unified Communications Manager IM and Presence Service 14 affected
14SU1 affected
14SU2 affected
14SU2a affected
14SU3 affected
15 affected
15SU1 affected
14SU4 affected
… +5 more rows
Cisco Cisco Unity Connection 14 affected
14SU1 affected
14SU2 affected
14SU3 affected
14SU3a affected
15 affected
15SU1 affected
14SU4 affected
… +5 more rows
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I. Basic Information for CVE-2026-76476

Vulnerability Information
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Vulnerability Title
Cisco Unified Communications Products Hardening Release: October 2026 - Improper Input Validation Vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability 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-2026-76476 are related to issues concerning improper input validation that are grouped under the Common Weakness Enumeration (CWE) Class CWE-20.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Emergency Responder 14 -
Cisco Cisco Unified Communications Manager 14 -
Cisco Cisco Unified Communications Manager IM and Presence Service 14 -
Cisco Cisco Unity Connection 14 -

II. Public POCs for CVE-2026-76476

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III. Intelligence Information for CVE-2026-76476

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Other References for CVE-2026-76476 (1)

Same Patch Batch · Cisco · 2026-10-21 · 34 CVEs total

CVE-2026-76466 9.8 CRITICAL Cisco Expressway Series Remote Code Execution Vulnerability
CVE-2026-76473 9.8 CRITICAL Cisco Unified Communications Products Hardening Release: October 2026 - Improper control o
CVE-2026-76474 9.8 CRITICAL Cisco Unified Communications Products Hardening Release: October 2026 - Improper Authentic
CVE-2026-76475 9.3 CRITICAL Cisco Unified Communications Products Hardening Release: October 2026 - Cross-site Scripti
CVE-2026-20043 9.0 CRITICAL Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
CVE-2026-76477 8.8 HIGH Cisco Unified Communications Products Hardening Release: October 2026 - Injection Vulnerab
CVE-2026-76478 8.8 HIGH Cisco Unified Communications Products Hardening Release: October 2026 - Improper Access Co
CVE-2026-76490 8.6 HIGH Cisco Expressway Series Software Hardening Release: October 2026 - Out-of-bounds Write Vul
CVE-2026-76524 7.8 HIGH Open Source Snort 3 Control Channel Socket Aribitrary Command Execution Vulnerability
CVE-2026-20291 7.8 HIGH Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
CVE-2026-76479 7.8 HIGH Cisco Unified Communications Products Hardening Release: October 2026 - Path Traversal Vul
CVE-2026-76494 7.8 HIGH Cisco Expressway Series Software Hardening Release: October 2026 - Code Injection Vulnerab
CVE-2026-76495 7.8 HIGH Cisco Expressway Series Software Hardening Release: October 2026 - Incorrect Permission As
CVE-2026-76505 7.5 HIGH Cisco IOS XR Software for ASR 9000 Series Routers IPv4 Unicast Packets Denial of Service V
CVE-2026-76491 7.5 HIGH Cisco Expressway Series Software Hardening Release: October 2026 - Denial of Service Vulne
CVE-2026-76492 7.5 HIGH Cisco Expressway Series Software Hardening Release: October 2026 - NULL Pointer Vulnerabil
CVE-2026-20236 7.5 HIGH Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
CVE-2026-76493 7.5 HIGH Cisco Expressway Series Software Hardening Release: October 2026 - Uncaught Exception Vuln
CVE-2026-20356 7.5 HIGH Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
CVE-2026-76481 7.5 HIGH Cisco Unified Communications Products Hardening Release: October 2026 - Improper Check or

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco Emergency Responder
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2026-76476

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