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CVE-2026-76478

Cisco Unified Communications Products Hardening Release: October 2026 - Improper Access Control Vulnerabilities

No known exploitation. EPSS puts it in the 4th percentile. No fix published yet.

CVSS 3.18.8HighEPSS percentile4th0.1% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFixNone yetNo fix or workaround published

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

No fixed build or workaround is published yet. Limit exposure and watch for a patch.

  • Cisco Emergency ResponderAffected: 14Upgrade to: not statedAffected: 14SU1Upgrade to: not statedAffected: 14SU2Upgrade to: not statedAffected: 14SU3Upgrade to: not stated + 10 more branchesStated by: CVE record
  • Cisco Unified Communications ManagerAffected: 14Upgrade to: not statedAffected: 14SU1Upgrade to: not statedAffected: 14SU2Upgrade to: not statedAffected: 14SU3Upgrade to: not stated + 19 more branchesStated by: CVE record
  • Cisco Unified Communications Manager IM and Presence ServiceAffected: 14Upgrade to: not statedAffected: 14SU1Upgrade to: not statedAffected: 14SU2Upgrade to: not statedAffected: 14SU2aUpgrade to: not stated + 9 more branchesStated by: CVE record
  • Cisco Unity ConnectionAffected: 14Upgrade to: not statedAffected: 14SU1Upgrade to: not statedAffected: 14SU2Upgrade to: not statedAffected: 14SU3Upgrade to: not stated + 9 more branchesStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

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-2026-76478 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-284.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS4th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.1% chance of exploitation activity in the next 30 days, which ranks it in the 4th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

4 events over 1 day, from the signal feeds we watch.

  1. Record updatedrecord updated
  2. Publishedweakness classified

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Scored 8.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

Sources

References in the record

In the news

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