CVE-2026-108185: Zoom Client Information Disclosure Flaw

CVE-2026-108185 Overview

CVE-2026-108185 is an improper certificate validation vulnerability [CWE-295] affecting the My Notes feature of certain Zoom Clients. The flaw allows an unauthenticated attacker with network access to intercept communications and disclose sensitive information. The vulnerability stems from the client's failure to properly validate certificates presented during network transactions associated with the My Notes feature.

Zoom documented the issue in security bulletin ZSB-26022. The attack requires network-adjacent positioning and favorable conditions to succeed, which raises exploitation complexity. Successful exploitation impacts both confidentiality and integrity of transmitted data.

Critical Impact
An unauthenticated attacker positioned on the network path can intercept or manipulate My Notes traffic in affected Zoom Clients, exposing sensitive user data and enabling tampering with notes content.

Affected Products

Zoom Clients with the My Notes feature enabled (specific versions listed in Zoom Security Bulletin ZSB-26022)
Refer to Zoom Security Bulletin ZSB-26022 for the complete affected version matrix

Discovery Timeline

2026-10-13 - CVE-2026-108185 published to the National Vulnerability Database
2026-10-15 - Last updated in NVD database

Technical Details for CVE-2026-108185

Vulnerability Analysis

The vulnerability is classified as Improper Certificate Validation [CWE-295]. The My Notes feature in affected Zoom Clients establishes network communications without correctly verifying the authenticity of the server certificate. An attacker who can intercept traffic between the client and the server can present a fraudulent certificate that the client accepts as valid.

Once the client trusts the attacker-controlled endpoint, the attacker can decrypt, read, and modify data flowing through the tunnel. Because the vulnerability does not require authentication or user interaction, any network-adjacent adversary with the ability to intercept client traffic can attempt exploitation. The attack complexity remains high because the attacker must occupy a privileged network position, such as a shared wireless segment, a compromised router, or a hostile upstream relay.

Root Cause

The root cause is the absence of strict certificate chain validation in the My Notes network client. The client either accepts certificates that fail standard trust-chain verification or omits hostname pinning checks. This behavior breaks the trust guarantees of Transport Layer Security (TLS) for the affected traffic.

Attack Vector

Exploitation requires an on-path attacker between the Zoom Client and the My Notes backend service. The attacker intercepts the TLS handshake and substitutes a controlled certificate. Because validation is improper, the client proceeds to transmit notes content, metadata, and session data to the attacker-controlled proxy. The adversary can then forward or modify traffic before relaying it to the legitimate server.

No verified public exploit code is available for CVE-2026-108185. Refer to the Zoom Security Bulletin ZSB-26022 for vendor-provided technical details.

Detection Methods for CVE-2026-108185

Indicators of Compromise

Unexpected TLS certificates presented by hosts in Zoom My Notes network sessions that do not chain to Zoom's issuing certificate authorities
Zoom Client connections terminating at unusual IP addresses or geographies inconsistent with normal Zoom infrastructure
Proxy or middlebox devices on the client path that perform TLS interception against Zoom endpoints

Detection Strategies

Inspect outbound TLS metadata from endpoints running Zoom Clients and compare presented certificate fingerprints against known-good Zoom certificate pins
Correlate DNS resolutions for Zoom service hostnames with destination IPs to identify traffic redirection
Alert on Zoom Client processes initiating sessions to non-Zoom autonomous system numbers (ASNs)

Monitoring Recommendations

Enable network telemetry collection for TLS Server Name Indication (SNI), Jarm, and JA3 fingerprints on segments where Zoom Clients operate
Monitor for repeated TLS handshake anomalies originating from Zoom Client binaries
Review wireless and VPN logs for rogue access points or unexpected gateways in environments where users run Zoom

How to Mitigate CVE-2026-108185

Immediate Actions Required

Update all Zoom Clients to the fixed version identified in Zoom Security Bulletin ZSB-26022
Restrict use of the My Notes feature on untrusted networks until patching is complete
Audit endpoints to inventory installed Zoom Client versions and prioritize remediation for mobile and remote users

Patch Information

Zoom has released fixed versions addressing CVE-2026-108185. Administrators should consult the Zoom Security Bulletin ZSB-26022 for the specific client versions and installation guidance. Deploy the update through enterprise software distribution tools and verify version compliance across managed endpoints.

Workarounds

Require users to connect through corporate virtual private networks (VPNs) when accessing Zoom services from untrusted networks
Disable or restrict the My Notes feature via administrative policy where feasible until clients are patched
Enforce certificate pinning or TLS inspection policies at the network perimeter to detect unauthorized certificate substitution

bash

# Example: enumerate installed Zoom Client version on Windows endpoints
reg query "HKLM\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX" /v DisplayVersion