CVE-2023-28806: An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to dis

Q: How do I fix CVE-2023-28806?

client connector: upgrade to 4.2.0.190. Exact commands for each OS are on this page.

Q: Is CVE-2023-28806 being exploited?

CVE-2023-28806 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-28806 affect?

CVE-2023-28806 affects client connector. Severity is medium (CVSS 5.7). An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.

Q: How urgent is CVE-2023-28806?

Priority 22/100. No elevated risk signals yet.

Routine

MEDIUM 5.7UPGRADE

CVE-2023-28806 is a medium-severity flaw (CVSS 5.7) affecting client connector. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-347
Published	2024-08-06
Last modified	2026-06-17

Publisher (CNA): Zscaler, Inc. · Vendor: zscaler

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-08-06 16:15 UTCPublished CVE record published
2026-06-17 05:48 UTCUpdated Record last modified

zscaler client connector UPGRADE

Affected: < 4.2.0.190

Fixed in: 4.2.0.190

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy client-connector || rpm -q client-connector || client-connector --version

2. UPGRADE to 4.2.0.190 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade client-connector

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade client-connector

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-28806?

client connector: upgrade to 4.2.0.190. Exact commands for each OS are on this page.

Is CVE-2023-28806 being exploited?

CVE-2023-28806 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-28806 affect?

CVE-2023-28806 affects client connector. Severity is medium (CVSS 5.7). An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.

How urgent is CVE-2023-28806?

Priority 22/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities

Related CVEs

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References

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