CVE-2026-21755 describes an improper restriction of excessive authentication attempts in HCLSoftware's HCL Hive product, specifically version 1.0. The vulnerability arises from the absence of rate limiting controls, which could enable attackers to repeatedly attempt authentication without restriction. This increases the risk of successful brute-force or credential stuffing attacks, or could be exploited to cause denial of service by overwhelming the authentication mechanism. The CVSS 3.1 base score is 5.3, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to integrity loss without confidentiality or availability impact. No known exploits are reported in the wild, and no vendor remediation or patch is currently documented.

The vulnerability allows attackers to attempt unlimited authentication attempts, increasing the likelihood of unauthorized access through brute-force or credential stuffing. It also presents a risk of denial of service by exhausting authentication resources. The impact is limited to integrity loss, with no direct confidentiality or availability impact noted in the CVSS vector.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, organizations should consider implementing external rate limiting or monitoring controls on authentication attempts to mitigate brute-force risks. No official vendor remediation or temporary fix is currently documented.