CVE-2026-59570: CWE-20 Improper input validation in Zscaler Client Connector
On affected versions of Zscaler client connector, a pre-installed peer app can tear down the Zscaler tunnel, force user logout, and toggle packet capture.
AI Analysis
Technical Summary
CVE-2026-59570 is a vulnerability in Zscaler Client Connector caused by improper input validation (CWE-20). It allows a pre-installed peer app to tear down the Zscaler tunnel, force user logout, and toggle packet capture. The CVSS 3.1 base score is 7.5, reflecting local attack vector, high attack complexity, low privileges required, no user interaction, scope change, no confidentiality impact, but high integrity and availability impact.
Potential Impact
An attacker with local low-privilege access can disrupt secure network tunnels established by Zscaler Client Connector, forcibly log out users, and manipulate packet capture settings. This can lead to denial of service and integrity issues within the client’s secure communications.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, monitor Zscaler advisories for updates. Limit local access to trusted users and applications to reduce risk until a fix is available.
CVE-2026-59570: CWE-20 Improper input validation in Zscaler Client Connector
Description
On affected versions of Zscaler client connector, a pre-installed peer app can tear down the Zscaler tunnel, force user logout, and toggle packet capture.
CVSS v3.1
Score 7.5high
Affected software
Zscaler
Client Connector
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-59570 is a vulnerability in Zscaler Client Connector caused by improper input validation (CWE-20). It allows a pre-installed peer app to tear down the Zscaler tunnel, force user logout, and toggle packet capture. The CVSS 3.1 base score is 7.5, reflecting local attack vector, high attack complexity, low privileges required, no user interaction, scope change, no confidentiality impact, but high integrity and availability impact.
Potential Impact
An attacker with local low-privilege access can disrupt secure network tunnels established by Zscaler Client Connector, forcibly log out users, and manipulate packet capture settings. This can lead to denial of service and integrity issues within the client’s secure communications.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, monitor Zscaler advisories for updates. Limit local access to trusted users and applications to reduce risk until a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Zscaler
- Date Reserved
- 2026-07-06T06:18:59.633Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa80c6a55bf5e2cf537f484
Added to database: 09/14/2026, 15:02:02 UTC
Last enriched: 09/14/2026, 15:16:28 UTC
Last updated: 09/15/2026, 05:12:18 UTC
Views: 15
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.