CVE-2026-21752: HCL Hive Auth Bypass Vulnerability

CVE-2026-21752 Overview

CVE-2026-21752 affects HCL Hive due to the inclusion of vulnerable third-party components. Attackers can exploit publicly documented security flaws in these bundled dependencies to gain unauthorized access to the system. The weakness is categorized under [CWE-1104] (Use of Unmaintained Third Party Components).

The vulnerability is remotely exploitable over the network without authentication or user interaction. According to the CVSS vector, exploitation affects confidentiality only, with no direct impact on integrity or availability. HCL Software has published a knowledge base article addressing the issue.

Critical Impact
Unauthenticated network attackers can leverage known flaws in vulnerable third-party components bundled with HCL Hive to compromise the confidentiality of the affected system.

Affected Products

HCL Hive

Discovery Timeline

2026-08-24 - CVE-2026-21752 published to the National Vulnerability Database (NVD)
2026-08-24 - Last updated in the NVD database

Technical Details for CVE-2026-21752

Vulnerability Analysis

CVE-2026-21752 stems from HCL Hive shipping with third-party components that contain publicly documented vulnerabilities. When vendors bundle unmaintained or unpatched libraries, attackers inherit a known-good exploit inventory against the parent application. The weakness is classified under [CWE-1104], which covers reliance on components no longer supported or containing unaddressed defects.

The attack surface is network-reachable, and exploitation does not require authentication or user interaction. Attack complexity is low, meaning an attacker can weaponize existing public exploits against known-vulnerable dependencies with minimal preparation.

Root Cause

The root cause is dependency hygiene. HCL Hive incorporates third-party libraries whose flaws have been publicly disclosed. Without upgrading, patching, or removing those components, the parent application remains exposed to any exploit that targets the bundled dependency.

Attack Vector

An attacker interacts with HCL Hive over the network and targets the vulnerable third-party component embedded in the product. Because the specific components are not enumerated in the public advisory, defenders should treat the HCL Software Knowledge Base entry as the authoritative source for component identification and impacted versions. See the HCL Software Knowledge Base Article for vendor guidance.

No public exploit code is currently listed for CVE-2026-21752, and the vulnerability is not present on the CISA Known Exploited Vulnerabilities list.

Detection Methods for CVE-2026-21752

Indicators of Compromise

Unexpected outbound requests from HCL Hive hosts to unknown external endpoints, which may indicate exploitation of a bundled library.
Anomalous read access to sensitive configuration files or data stores served by HCL Hive processes.
Web or application log entries showing malformed inputs targeting components matching known-vulnerable library signatures.

Detection Strategies

Run a software composition analysis (SCA) scan against HCL Hive installations to enumerate embedded third-party libraries and match them against public vulnerability feeds.
Correlate HCL Hive process telemetry with network egress data to surface unauthorized data access patterns.
Deploy signature and behavioral rules that flag exploitation attempts against the most common vulnerable libraries referenced in the vendor knowledge base.

Monitoring Recommendations

Monitor HCL Hive application logs for authentication failures, unusual query volumes, and unexpected error stack traces referencing third-party classes or modules.
Track the HCL Software Knowledge Base article for updates that identify specific components and fixed versions.
Alert on new listener ports, child processes, or scheduled tasks originating from HCL Hive service accounts.

How to Mitigate CVE-2026-21752

Immediate Actions Required

Consult the HCL Software Knowledge Base Article and identify the fixed release for your HCL Hive deployment.
Inventory all HCL Hive instances, including non-production and disaster-recovery environments, and prioritize patching for internet-exposed systems.
Restrict inbound network access to HCL Hive management interfaces until the upgrade is complete.

Patch Information

HCL Software has published remediation guidance in knowledge base article KB0131731. Administrators should apply the vendor-provided update or component replacement that addresses the vulnerable third-party dependencies. Verify the fix by re-running SCA tooling after upgrade.

Workarounds

Place HCL Hive behind a web application firewall or reverse proxy configured to block known exploit payloads targeting the underlying vulnerable libraries.
Apply network segmentation so that only trusted management networks can reach HCL Hive service endpoints.
Disable or remove any HCL Hive features that load the vulnerable component if the vendor documents such a configuration option.

bash

# Configuration example
# Restrict HCL Hive service exposure to trusted management subnets
iptables -A INPUT -p tcp --dport <hive_port> -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport <hive_port> -j DROP