CVE-2026-76462
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Privilege Escalation in Cisco Secure Client via IPC Channel
Vulnerability report for CVE-2026-76462, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-21
Last updated on: 2026-10-21
Assigner: Cisco Systems, Inc.
Description
Description
A vulnerability in the interprocess communication (IPC) channel of the Secure Firewall Posture module in Cisco Secure Client could allow an authenticated, local attacker to elevate privileges on an affected device.
This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a series of crafted IPC messages to a local socket. A successful exploit could allow the attacker to perform limited file write operations on the filesystem with SYSTEM or root privileges.
Although this vulnerability affects the Secure Firewall Posture module in Cisco Secure Client on Windows, macOS, and Linux operating systems, this vulnerability could be used to obtain full root privileges on macOS and Linux. For that reason Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Cisco | Cisco | Secure Client 4.9.00086 |
| Cisco | Cisco | Secure Client 4.9.01095 |
| Cisco | Cisco | Secure Client 4.9.02028 |
| Cisco | Cisco | Secure Client 4.9.03047 |
| Cisco | Cisco | Secure Client 4.9.03049 |
| Cisco | Cisco | Secure Client 4.9.04043 |
| Cisco | Cisco | Secure Client 4.9.04053 |
| Cisco | Cisco | Secure Client 4.9.05042 |
| Cisco | Cisco | Secure Client 4.9.06037 |
| Cisco | Cisco | Secure Client 4.10.00093 |
| Cisco | Cisco | Secure Client 4.10.01075 |
| Cisco | Cisco | Secure Client 4.10.02086 |
| Cisco | Cisco | Secure Client 4.10.03104 |
| Cisco | Cisco | Secure Client 4.10.04065 |
| Cisco | Cisco | Secure Client 4.10.04071 |
| Cisco | Cisco | Secure Client 4.10.05085 |
| Cisco | Cisco | Secure Client 4.10.05095 |
| Cisco | Cisco | Secure Client 5.0.00238 |
| Cisco | Cisco | Secure Client 4.10.05111 |
| Cisco | Cisco | Secure Client 5.0.00529 |
| Cisco | Cisco | Secure Client 5.0.00556 |
| Cisco | Cisco | Secure Client 4.10.06079 |
| Cisco | Cisco | Secure Client 5.0.01242 |
| Cisco | Cisco | Secure Client 4.10.06090 |
| Cisco | Cisco | Secure Client 5.0.02075 |
| Cisco | Cisco | Secure Client 4.10.07061 |
| Cisco | Cisco | Secure Client 5.0.03072 |
| Cisco | Cisco | Secure Client 4.10.07062 |
| Cisco | Cisco | Secure Client 5.0.03076 |
| Cisco | Cisco | Secure Client 5.0.04032 |
| Cisco | Cisco | Secure Client 4.10.07073 |
| Cisco | Cisco | Secure Client 5.0.05040 |
| Cisco | Cisco | Secure Client 5.1.0.136 |
| Cisco | Cisco | Secure Client 5.1.1.42 |
| Cisco | Cisco | Secure Client 4.10.08025 |
| Cisco | Cisco | Secure Client 5.1.2.42 |
| Cisco | Cisco | Secure Client 4.10.08029 |
| Cisco | Cisco | Secure Client 5.1.3.62 |
| Cisco | Cisco | Secure Client 5.1.4.74 |
| Cisco | Cisco | Secure Client 5.1.5.65 |
| Cisco | Cisco | Secure Client 5.1.6.103 |
| Cisco | Cisco | Secure Client 5.1.7.80 |
| Cisco | Cisco | Secure Client 5.1.8.105 |
| Cisco | Cisco | Secure Client 5.1.8.122 |
| Cisco | Cisco | Secure Client 5.1.9.113 |
| Cisco | Cisco | Secure Client 5.1.10.233 |
| Cisco | Cisco | Secure Client 5.1.11.388 |
| Cisco | Cisco | Secure Client 5.1.12.146 |
| Cisco | Cisco | Secure Client 5.1.13.117 |
| Cisco | Cisco | Secure Client 5.1.13.177 |
| Cisco | Cisco | Secure Client 5.1.14.145 |
| Cisco | Cisco | Secure Client 5.1.15.287 |
| Cisco | Cisco | Secure Client 5.1.16.194 |
| Cisco | Cisco | Secure Client 5.1.17.3382 |
| Cisco | Cisco | Secure Client 5.1.17.3394 |
| Cisco | Cisco | Secure Client 5.1.18.314 |
| Cisco | Cisco | Secure Client 5.1.19.1862 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-20 | The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. |
