# CVE-2026-56583: HCL MyCloud concurrent login vulnerability

Source: https://junglewise.ai/threats/cve-2026-56583-hcl-mycloud-concurrent-login-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-21. Updated: 2026-07-21  
License: CC BY 4.0 with a link back

CVE-2026-56583 · Severity: low · CVSS 3.1 · Published 2026-07-21

HCL MyCloud, a cloud management platform, is affected by a vulnerability that allows multiple simultaneous logins for the same user account. This flaw increases the risk that an unauthorized person could maintain access to an account or hijack an active session without being disconnected. While the risk is rated as low, it could lead to unauthorized access to sensitive corporate data or account misuse.

Technologies: [HCL Software MyCloud](https://junglewise.ai/threats/technologies/mycloud). Vendors: [HCL Software](https://junglewise.ai/threats/vendors/hcl-software).

## Quick answers

**Is CVE-2026-56583 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56583 being exploited in the wild.

**How severe is CVE-2026-56583?** Low severity, with a CVSS score of 3.1, published 21 July 2026.

**Which products and versions are affected?** HCL Software MyCloud 10.8.2.

**Is there a fix for CVE-2026-56583?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-56583 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-56583?** Check whether you run HCL Software MyCloud at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

HCL MyCloud version 10.8.2 is vulnerable to insufficient session expiration (CWE-613), specifically manifesting as a concurrent login vulnerability. The application fails to invalidate existing sessions or prevent multiple simultaneous active sessions for a single user account. An authenticated attacker with network access could exploit this to maintain persistence or perform session hijacking. The vulnerability has a low CVSS score (3.1) because it requires low privileges and high attack complexity, primarily impacting confidentiality. Users are advised to refer to HCL security bulletin KB0132381 for remediation steps.

## Affected products

- HCL Software MyCloud 10.8.2

## Timeline

- 2026-07-21: disclosed
- 2026-07-21: advisory

## References

- [https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0132381](https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0132381)

## Related threats

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- [HCL MyCloud use of unmaintained components in IIS Server](https://junglewise.ai/threats/cve-2026-56580-hcl-mycloud-use-of-unmaintained-components-in-iis-server)
- [HCL MyCloud sensitive information disclosure in HTTP response](https://junglewise.ai/threats/cve-2026-56579-hcl-mycloud-sensitive-information-disclosure-in-http-response)
- [HCL MyCloud server version disclosure](https://junglewise.ai/threats/cve-2026-56578-hcl-mycloud-server-version-disclosure)