CVE-2026-108185 in Zoom Client
Summary
by MITRE • 10/13/2026
Improper certificate validation in the My Notes feature of certain Zoom Clients may allow an unauthenticated user to conduct an information disclosure via network access.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified within the My Notes feature of specific versions of Zoom Client represents a critical failure in cryptographic implementation, specifically categorized under CWE-295: Improper Certificate Validation. This flaw arises from the application's inability or refusal to properly verify the authenticity and integrity of digital certificates presented during secure communication sessions. In standard Transport Layer Security (TLS) protocols, certificate validation is essential to ensure that the client is communicating with a legitimate server and not an imposter. When this process is bypassed or executed incorrectly, the cryptographic guarantees provided by HTTPS are effectively nullified for the affected component, allowing attackers to intercept, modify, or eavesdrop on data transmitted between the Zoom client and its backend services without triggering security warnings or connection failures.
From a technical perspective, improper certificate validation often manifests as accepting self-signed certificates, ignoring expiration dates, failing to verify the chain of trust up to a trusted root authority, or disabling hostname verification entirely. In the context of the My Notes feature, this likely means that when the client synchronizes notes with Zoom's cloud infrastructure, it does not rigorously validate the server's identity. This oversight creates an open path for man-in-the-middle attacks where an adversary positioned on the network can perform active interception. By exploiting this weakness, a remote unauthenticated attacker can decrypt sensitive information stored in or transmitted through the My Notes module, including meeting summaries, personal annotations, and potentially credentials if they are cached locally after synchronization.
The operational impact of this vulnerability is significant due to the nature of the data involved. Zoom serves as a primary communication tool for enterprises, educational institutions, and government bodies, making it a high-value target for espionage and corporate intelligence gathering. The ability to conduct information disclosure without authentication lowers the barrier to entry for attackers considerably. An adversary does not need valid user credentials or complex exploit chains; they merely require network access within range of the victim's connection, such as on public Wi-Fi networks or compromised internal LANs. This aligns with MITRE ATT&CK technique T1078: Valid Accounts if combined with credential theft, but more directly relates to T1557: Adversary-in-the-Middle, where the attacker sits between two communicating parties to steal information. The exposure of meeting notes can lead to severe privacy violations and competitive disadvantage for organizations relying on these digital records for decision-making or compliance reporting.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. For end-users, the most effective countermeasure is to update Zoom Client to the latest version where this validation logic has been corrected by the vendor. Administrators should enforce software update policies across all endpoints to ensure that vulnerable versions are not in use within corporate environments. Additionally, organizations can implement network-level controls such as SSL inspection proxies configured with strict certificate pinning or mutual TLS requirements for internal traffic, although care must be taken to avoid breaking legitimate application functionality. From a development standpoint, the engineering team should adopt secure coding practices that mandate explicit validation of all X.509 certificates against trusted root stores and enforce hostname verification strictly according to RFC 2818 standards. Regular security audits focusing on cryptographic implementations are essential to prevent similar flaws in other modules where sensitive data is exchanged over network connections.