HCL MyCloud CVE-2026-56577

Exploitation requires network-level access to the HCL MyCloud login interface and knowledge of valid usernames or email addresses registered on the platform. The attack is constrained by any rate-limiting, CAPTCHA, or account lockout mechanisms the deployment may have in place - the advisory does not confirm whether such controls exist by default. The vendor CVSS vector assigns AC:H and PR:L, suggesting HCL considers this non-trivial to exploit and that some level of existing access or account knowledge is required; however, this contrasts with the typical brute-force threat model where PR:N is standard. Exploitation is limited to environments where strong password policies and MFA are not enforced externally (e.g., via an IdP or SSO layer). The vulnerability does NOT affect deployments where authentication is delegated entirely to an external identity provider that enforces its own password policy.

The vendor-supplied CVSS 3.1 vector (AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L, score 3.1) presents several notable inconsistencies worth flagging for security teams. First, PR:L implies the attacker already holds low-privilege credentials - but the core threat of a weak password policy is enabling unauthorized acquisition of credentials, making PR:N more appropriate for the attacker's initial position. Second, the impact metrics C:N and I:N but A:L are counterintuitive: successful credential attacks primarily threaten confidentiality and integrity (account data, stored content), not availability. No EPSS score was provided, and this CVE is not listed in the CISA KEV catalog. No POC is known. Real-world risk is moderate-to-low given the niche deployment footprint of HCL MyCloud, but organizations using the platform should treat credential-based attack surface seriously regardless of the low CVSS score, as weak password policies are a reliable enabler of account takeover in any cloud application.

An attacker targeting a known HCL MyCloud user account obtains a list of commonly used passwords or previously leaked credential pairs and submits automated login requests against the MyCloud authentication endpoint. Because the platform does not enforce strong password requirements, a significant fraction of accounts may use short or dictionary-based passwords, allowing the attacker to gain unauthorized access to a user's cloud workspace and any data or files stored therein. No public exploit code or tooling specific to this CVE is known at time of analysis.