# CVE-2026-66987: HCL AION weak account lockout brute-force

Source: https://junglewise.ai/threats/cve-2026-66987-hcl-aion-is-affected-by-a-vulnerability-where-the-account-lockout  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-66987 · Severity: medium · CVSS 5.3 · Published 2026-11-06

HCL AION is a software platform that controls access to user accounts. A weakness in its account lockout mechanism allows attackers to make unlimited password guesses without sufficient delays or restrictions, enabling brute-force attacks that could lead to unauthorized account access and data breach.

Technologies: [HCL AION](https://junglewise.ai/threats/technologies/aion). Vendors: [HCL](https://junglewise.ai/threats/vendors/hcl).

## Quick answers

**Is CVE-2026-66987 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66987 being exploited in the wild.

**How severe is CVE-2026-66987?** Medium severity, with a CVSS score of 5.3, published 6 November 2026.

**Which products and versions are affected?** HCL AION.

**Is there a fix for CVE-2026-66987?** 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-2026-66987 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-66987?** Check whether you run HCL AION. 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

The vulnerability stems from insufficient rate-limiting or delays in the account lockout mechanism, allowing an attacker to perform repeated failed login attempts without adequate restrictions. This is a brute-force attack vector requiring network access and no prior authentication. A successful attack results in account compromise and unauthorized access to the system.

## Affected products

- HCL AION

## Timeline

- 2026-11-06: disclosed

## References

- [https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0135217](https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0135217)

## Related threats

- [HCL AION HTTP Host header injection](https://junglewise.ai/threats/cve-2026-66981-hcl-aion-is-affected-by-a-vulnerability-where-the-application)
- [HCL AION missing Cross-Origin-Opener-Policy header](https://junglewise.ai/threats/cve-2026-35113-hcl-aion-is-affected-by-a-vulnerability-where-the-cross-origin)
- [HCL AION missing Cross-Origin-Embedder-Policy header](https://junglewise.ai/threats/cve-2026-35112-hcl-aion-is-affected-by-a-vulnerability-where-the-cross-origin)
- [HCL AION missing cross-origin resource policy header](https://junglewise.ai/threats/cve-2026-35111-hcl-aion-is-affected-by-a-vulnerability-where-the-cross-origin)
- [HCL AION unencrypted communication enforcement](https://junglewise.ai/threats/cve-2026-35110-hcl-aion-is-affected-by-a-vulnerability-where-encrypted-https)