CVE-2026-85974 in MarkLogic Server
Summary
by MITRE • 10/12/2026
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7 do not consistently validate TLS certificate hostnames for certain outbound connections. A network-positioned attacker could exploit this weakness to intercept or modify communications with an affected service.
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability identified in Progress MarkLogic Server versions prior to 12.1.0 and 11.x releases before 11.3.7 represents a critical failure in the implementation of Transport Layer Security (TLS) protocols during outbound network communications. This flaw stems from an inconsistent validation mechanism for TLS certificate hostnames, which is a fundamental security control designed to ensure that a client connects to the intended server and not to an imposter. In secure cryptographic implementations, when a client initiates a connection to a remote service, it must verify that the hostname presented in the server's digital certificate matches the expected destination address. This process prevents man-in-the-middle attacks by ensuring identity authenticity at the transport layer. However, in these specific versions of MarkLogic Server, this validation is not consistently applied across all outbound connections, creating gaps where an attacker can bypass authentication checks without triggering security alerts or connection failures.
From a technical perspective, the core issue lies in how the application handles certificate verification logic for various types of outgoing requests. While some endpoints may correctly enforce strict hostname matching, others fail to perform this check entirely or rely on weaker validation methods that do not account for common attack vectors such as Subject Alternative Name (SAN) mismatches or wildcard certificate abuse. This inconsistency means that an attacker positioned within the network path between MarkLogic Server and its downstream services can intercept TLS handshakes. By presenting a valid but unauthorized certificate, potentially obtained through compromised Certificate Authorities or internal PKI manipulation, the attacker establishes encrypted sessions with both the client and the server simultaneously. Because the server does not consistently validate that the peer's identity matches the expected hostname, it accepts these fraudulent connections as legitimate, thereby breaking the chain of trust essential for secure communication.
The operational impact of this vulnerability is severe, primarily enabling man-in-the-middle (MITM) attacks against outbound traffic originating from MarkLogic Server instances. A network-positioned attacker can exploit this weakness to perform passive eavesdropping or active session hijacking. In a passive scenario, the attacker gains access to sensitive data transmitted over these connections, including database queries, configuration details, and potentially user credentials if they are sent in plaintext within application layers above TLS. In an active scenario, the attacker can modify communications by injecting malicious commands, altering query results, or redirecting traffic to rogue services without detection. This compromises both the confidentiality and integrity of data flowing out of the MarkLogic environment, which is particularly dangerous given that database servers often handle highly sensitive enterprise information and serve as central hubs for critical business operations.
This vulnerability aligns with CWE-295 Improper Certificate Validation, specifically highlighting failures in verifying certificate hostnames during TLS connections. It also maps to MITRE ATT&CK technique T1078 Valid Accounts if the attacker leverages stolen credentials obtained through interception, and more directly to techniques involving network sniffing or credential harvesting such as Network Sniffing (T1040) when used for passive data collection. The lack of consistent validation undermines the foundational assumptions of public key infrastructure, allowing attackers to exploit trust relationships that should be strictly enforced by cryptographic protocols.
To mitigate this risk, organizations running affected versions must immediately upgrade MarkLogic Server to version 12.1.0 or later, or if on the 11.x branch, update to at least 11.3.7 where these validation checks have been corrected and hardened. Until patching is complete, administrators should implement network-level controls such as strict firewall rules that restrict outbound connections only to known, trusted IP addresses and ports, reducing the attack surface for interception attempts. Additionally, deploying intrusion detection systems capable of analyzing TLS handshake anomalies may help identify suspicious certificate presentations or unexpected connection patterns. It is also advisable to review internal PKI policies to ensure that wildcard certificates are used cautiously and that strict hostname matching is enforced at the application configuration level wherever possible, providing a defense-in-depth strategy against exploitation of this specific flaw.