CVE-2023-28806
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceZscaler Client Connector on Windows contains an improper signature validation vulnerability that allows an authenticated user to bypass anti-tampering protections. The flaw exists in versions prior to 4.2.0.190 and could allow a local attacker to disable security controls.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 4.2.0.190CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify Zscaler Client Connector is installedCheck if Zscaler Client Connector is present on the Windows system using Add/Remove Programs or program listingsAffected if The application is not found on the system (not affected)
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Retrieve the installed versionObtain the Zscaler Client Connector version number from the Windows systemAffected if Unable to determine version (further investigation needed)
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Compare against vulnerable version rangeCompare your installed version to the affected range: versions prior to 4.2.0.190Affected if Installed version is less than 4.2.0.190 (affected)
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Verify anti-tampering protection is in useConfirm whether anti-tampering or security control features are enabled within Zscaler Client ConnectorAffected if Anti-tampering protections are active and version is below 4.2.0.190
The environment is affected if Zscaler Client Connector is installed with a version lower than 4.2.0.190 and has anti-tampering protections enabled.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped4.2.0.190
Upgrade Zscaler Client Connector to version 4.2.0.190 or later to remediate this vulnerability.
4.2.0.190 or later
- Upgrade Zscaler Client Connector on Windows to version 4.2.0.190 or later
- Verify the upgrade was successful by checking the Client Connector version in the application or system information
- Confirm anti-tampering protection is now properly enforced with signature validation
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-28806 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-28806 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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