CVE-2026-59570

Local tunnel disruption via unrestricted peer-app commands

Published Sep 14, 2026 · Updated Sep 14, 2026

Authorization failure in Zscaler Client Connector before 4.2.0.152 on Android and ChromeOS allows local users to disrupt protected traffic. The peer-app interface accepts sensitive control requests from another pre-installed application without adequately restricting tunnel teardown, user logout, or packet-capture toggling. Exploitation requires a peer application already installed on the device and can disconnect protected traffic, terminate the session, and alter diagnostic capture state.

CVSS severityUnavailable
Unscored
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization failure in Zscaler Client Connector before 4.2.0.152 on Android and ChromeOS allows local users to disrupt protected traffic. The peer-app interface accepts sensitive control requests from another pre-installed application without adequately restricting tunnel teardown, user logout, or packet-capture toggling. Exploitation requires a peer application already installed on the device and can disconnect protected traffic, terminate the session, and alter diagnostic capture state.

The record

CVE
CVE-2026-59570
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Zscaler
Product
Zscaler Client Connector
Classifications
T1629.003
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <Android: 4.2.0.152
  2. Affected versionversion=0 <ChromeOS: 4.2.0.152

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Zscaler · Zscaler Client Connectorversion=0 <Android: 4.2.0.152; version=0 <ChromeOS: 4.2.0.152

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1629.003Impair Defenses: Disable or Modify Tools

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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