Cisco Security Advisories guidance
Vendor revision: Sep 24, 2026Cisco has released software updates that address these vulnerabilities.
Overview
What is CVE-2026-76439?
A vulnerability in the endpoint posture status reporting functionality of the guest portal web application of Cisco ISE could allow an unauthenticated, remote attacker to submit forged posture status events into the endpoint posture pipeline.
This vulnerability is due to insufficient authentication on an internal interface that is exposed through the guest portal. An attacker could exploit this vulnerability by sending a crafted request to an affected system.
A successful exploit could allow the attacker to manipulate the posture status on the affected system.
Source: NVD
Official advisory
Configuration and update guidance
Cisco Security Advisories · Updated Sep 24, 2026
Affected products and configuration
CVE-2026-76439: At the time of publication, this vulnerability affected Cisco ISE, regardless of device configuration.
CVE-2026-76444, CVE-2026-76446, and CVE-2026-76447: At the time of publication, these vulnerabilities affected Cisco ISE and Cisco ISE-PIC, 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 these vulnerabilities.
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 these vulnerabilities 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 center and right columns indicate whether a release was affected by the vulnerabilities that are described in this advisory and which release included the fix for these vulnerabilities.
Cisco ISE or ISE-PIC Release | First Fixed Release for CVE-2026-76439, CVE-2026-76446, and CVE-2026-76447 | First Fixed Release for CVE-2026-76444 |
|---|---|---|
3.2 and earlier | Migrate to a fixed release. | Not vulnerable. |
3.3 | 3.3 Patch 12 | Not vulnerable. |
3.4 | 3.4 Patch 7 | 3.4 Patch 7 |
3.51 | 3.5 Patch 4 | 3.5 Patch 4 |
1. Cisco ISE-PIC has reached the end-of-sale date. Release 3.4 is the last supported release.
For instructions on upgrading a device, see the Upgrade Guides on the Cisco Identity Service Engine support page.
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 aware that a public announcement is available for the vulnerabilities that are described in this advisory.
The Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory.