Cisco Security Advisories guidance
Vendor revision: Oct 21, 2026To remediate the vulnerabilities that were disclosed on October 21, 2026, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories.
Overview
What is CVE-2026-76487?
A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct access control bypass attacks on an affected device.
This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device.
A successful exploit could allow the attacker to access parts of the network that are beyond the scope of their intended access.
Source: NVD
Official advisory
Configuration and update guidance
Cisco Security Advisories · Updated Oct 21, 2026
Affected products and configuration
At the time of publication, this vulnerability affected Cisco Unified CM and Unified CM SME, regardless of device configuration.
For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
Workarounds and temporary mitigations
There are no workarounds that address this vulnerability.
Fixed software
Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To remediate this vulnerability and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.
Fixed Releases
At the time of publication, the release information in the following table was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability that is described in this advisory and which release included the fix for this vulnerability.
Cisco Unified CM and Unified CM SME Release | First Fixed Release |
|---|---|
14 | Migrate to a fixed release. |
15 | 15SU5 |
Note: This fix is also included as part of the broader hardening improvements that are disclosed in the security advisory Cisco Unified Communications Products Security Hardening Release: October 2026.
The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
Exploitation status
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.