CVE-2023-28015: HCL Domino AppDev Pack is susceptible to a User Account Enumeration vulnerability

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-23 · updated 2026-06-17
Weakness: CWE-203

Description

The HCL Domino AppDev Pack IAM service is susceptible to a User Account Enumeration vulnerability. During a failed login attempt a difference in messages could allow an attacker to determine if the user is valid or not. The attacker could use this information to focus a brute force attack on valid users.

Affected products

HCL Software Domino AppDev Pack: before 1.0.16 — fixed in 1.0.16

How to fix

Upgrade to a fixed version: HCL Software Domino AppDev Pack 1.0.16. Check the vendor advisory for mitigations.

References

https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0105093
https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0105093

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