CVE-2026-76462 is a vulnerability in Cisco Secure Client
Published on October 21, 2026
Cisco Secure Client Privilege Escalation Vulnerability
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.
Vulnerability Analysis
CVE-2026-76462 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Weakness Type
Improper Input Validation
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.
Products Associated with CVE-2026-76462
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Affected Versions
Cisco Secure Client:- Version 4.9.00086 is affected.
- Version 4.9.01095 is affected.
- Version 4.9.02028 is affected.
- Version 4.9.03047 is affected.
- Version 4.9.03049 is affected.
- Version 4.9.04043 is affected.
- Version 4.9.04053 is affected.
- Version 4.9.05042 is affected.
- Version 4.9.06037 is affected.
- Version 4.10.00093 is affected.
- Version 4.10.01075 is affected.
- Version 4.10.02086 is affected.
- Version 4.10.03104 is affected.
- Version 4.10.04065 is affected.
- Version 4.10.04071 is affected.
- Version 4.10.05085 is affected.
- Version 4.10.05095 is affected.
- Version 5.0.00238 is affected.
- Version 4.10.05111 is affected.
- Version 5.0.00529 is affected.
- Version 5.0.00556 is affected.
- Version 4.10.06079 is affected.
- Version 5.0.01242 is affected.
- Version 4.10.06090 is affected.
- Version 5.0.02075 is affected.
- Version 4.10.07061 is affected.
- Version 5.0.03072 is affected.
- Version 4.10.07062 is affected.
- Version 5.0.03076 is affected.
- Version 5.0.04032 is affected.
- Version 4.10.07073 is affected.
- Version 5.0.05040 is affected.
- Version 5.1.0.136 is affected.
- Version 5.1.1.42 is affected.
- Version 4.10.08025 is affected.
- Version 5.1.2.42 is affected.
- Version 4.10.08029 is affected.
- Version 5.1.3.62 is affected.
- Version 5.1.4.74 is affected.
- Version 5.1.5.65 is affected.
- Version 5.1.6.103 is affected.
- Version 5.1.7.80 is affected.
- Version 5.1.8.105 is affected.
- Version 5.1.8.122 is affected.
- Version 5.1.9.113 is affected.
- Version 5.1.10.233 is affected.
- Version 5.1.11.388 is affected.
- Version 5.1.12.146 is affected.
- Version 5.1.13.117 is affected.
- Version 5.1.13.177 is affected.
- Version 5.1.14.145 is affected.
- Version 5.1.15.287 is affected.
- Version 5.1.16.194 is affected.
- Version 5.1.17.3382 is affected.
- Version 5.1.17.3394 is affected.
- Version 5.1.18.314 is affected.
- Version 5.1.19.1862 is affected.