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CVE-2021-26736

ZApp Installer Privilege Escalation Vulnerabilities

HIGH
7.8
CVSS Score
Published: October 23, 2023 at 01:21 PM UTC
Updated: June 17, 2026 at 03:43 AM UTC
1 product affected across 1 vendorClient Connector

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Multiple vulnerabilities in the Zscaler Client Connector Installer and Uninstaller for Windows prior to 3.6 allowed execution of binaries from a low privileged path. A local adversary may be able to execute code with SYSTEM privileges.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Client Connector· Zscaler
95%
v < 3.6
Affected range stops below 3.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Release Notes
Source: [email protected]
https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2021

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20CWE-22

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