# Zscaler vulnerabilities & exploitation

> As of 2026-10-27, Threadlinqs tracks 6 Zscaler CVEs, 0 in the CISA Known Exploited Vulnerabilities catalog, linked to 1 tracked threat campaign.

**Data as of:** 2026-10-27

## Exploitation timeline

Threadlinqs has recorded 6 Zscaler CVEs published between 2026-03-15 and 2026-08-15. The busiest month was 2026-08 (5 new CVEs). None of them is listed in CISA KEV yet.

## Most exploited vulnerabilities

Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 6 of 6 tracked Zscaler CVEs.

- [CVE-2026-59564](https://intel.threadlinqs.com/cve/CVE-2026-59564) — CRITICAL 9.1 · EPSS 0.5% · 2026-08-24
- [CVE-2026-59565](https://intel.threadlinqs.com/cve/CVE-2026-59565) — HIGH 8.8 · EPSS 0.5% · 2026-08-24
- [CVE-2026-22569](https://intel.threadlinqs.com/cve/CVE-2026-22569) — MEDIUM 5.4 · EPSS 0.2% · 2026-03-31
- [CVE-2026-59566](https://intel.threadlinqs.com/cve/CVE-2026-59566) — HIGH 8.4 · EPSS 0.2% · 2026-08-24
- [CVE-2026-59567](https://intel.threadlinqs.com/cve/CVE-2026-59567) — HIGH 8.8 · EPSS 0.1% · 2026-08-24
- [CVE-2026-59568](https://intel.threadlinqs.com/cve/CVE-2026-59568) — CRITICAL 9.1 · 2026-08-24

## Products affected

Threadlinqs normalises CPE and CNA product records across all 6 CVEs; 1 distinct Zscaler product is affected. The most frequently affected:

- Client Connector — 6 CVEs

## Threat activity

1 tracked threat campaign reference Zscaler products or exploit Zscaler CVEs:

- [Multiple Zscaler Client Connector Flaws Enable Remote Code Execution (CVE-2026-59568)](https://intel.threadlinqs.com/threat/TL-2026-2139) — CRITICAL — 2026-08-25

## How to prioritise Zscaler patching

This order follows the data Threadlinqs holds for Zscaler, not a generic severity checklist:

- No Zscaler CVE is in CISA KEV yet, so rank by exploit probability instead.
- Outside KEV, the highest EPSS scores are [CVE-2026-59564](https://intel.threadlinqs.com/cve/CVE-2026-59564) (0.5%), [CVE-2026-59565](https://intel.threadlinqs.com/cve/CVE-2026-59565) (0.5%), [CVE-2026-22569](https://intel.threadlinqs.com/cve/CVE-2026-22569) (0.2%).
- 2 CVEs score Critical and 3 High on CVSS v3 (maximum 9.1, average 8.3); sequence these after KEV and high-EPSS items.

## About this data

Vendor attribution comes from the CNA and CPE product records of each CVE, folded to one vendor name; CVSS, EPSS and KEV status are read from the Threadlinqs CVE catalog; campaign and actor links come from tracked threat records. Counts reflect the data as of 2026-10-27 and refresh daily.

Canonical: https://intel.threadlinqs.com/vendors/zscaler
All vendors: https://intel.threadlinqs.com/vendors
Full detection coverage and IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp