Affects widely deployed Cisco Unified Communications products used across enterprises; exploit could disrupt voice/collaboration infrastructure.
CVE-2026-76476
Improper input validation in Cisco Unified Communications may allow remote exploit or disruption.
Is CVE-2026-76476 being exploited?
Not confirmed. CVE-2026-76476 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.43% probability of exploitation in the next 30 days.
How severe is CVE-2026-76476?
CVE-2026-76476 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-76476?
Yes. A fix has been recorded for CVE-2026-76476. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-76476 affect?
CVE-2026-76476 affects Cisco Unified Communications Manager, Cisco Unified CM IM & Presence Service, Cisco Unified CM Session Management Edition, Cisco Unity Connection, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76476?
Apply Cisco hardening updates immediately and restrict access to UC management interfaces.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted inputs can enable remote code execution, command injection, privilege escalation, or denial-of-service of UC services.
Patch when possible
- affected14
- affected14SU1
- affected14SU2
- affected14SU3
- affected14SU3a
- affected15
- affected15SU1
- affected15SU1a
- affected14SU4
- affected15SU2
- affected15SU3
- affected14SU5
- affected15SU4
- affected14SU6
- affected14
- affected14SU1
- affected14SU2
- affected14SU3
- affected15
- affected15SU1
- affected14SU4
- affected14SU4a
- affected15SU1a
- affected15SU2
- affected15.0.1.13010-1
- affected15.0.1.13011-1
- affected15.0.1.13012-1
- affected15.0.1.13013-1
- affected15.0.1.13014-1
- affected15.0.1.13015-1
- affected15.0.1.13016-1
- affected15.0.1.13017-1
- affected15SU3a
- affected14SU5
- affected15SU4
- affected15SU4a
- affected14SU6
- affected14
- affected14SU1
- affected14SU2
- affected14SU2a
- affected14SU3
- affected15
- affected15SU1
- affected14SU4
- affected15SU2
- affected15SU3
- affected14SU5
- affected15SU4
- affected14SU6
- affected14
- affected14SU1
- affected14SU2
- affected14SU3
- affected14SU3a
- affected15
- affected15SU1
- affected14SU4
- affected15SU2
- affected15SU3
- affected14SU5
- affected15SU4
- affected14SU6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.