What’s Vulnerable › Vulnerabilities

CVE-2020-4126

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-01 · updated 2026-06-17
• Weakness: CWE-311

Description

HCL iNotes is susceptible to a sensitive cookie exposure vulnerability. This can allow an unauthenticated remote attacker to capture the cookie by intercepting its transmission within an http session. Fixes are available in HCL Domino and iNotes versions 10.0.1 FP6 and 11.0.1 FP2 and later.

Affected products

• HCL Software HCL iNotes: from 9.0 before 10.0.1; from 11.0.0 before 11.0.1; 10.0.1, 10.0.1-fixpack1, 10.0.1-fixpack2, 10.0.1-fixpack3, 10.0.1-fixpack4, 10.0.1-fixpack5 (+2) — fixed in 10.0.1, 11.0.1

How to fix

Upgrade to a fixed version: HCL Software HCL iNotes 10.0.1, 11.0.1. Check the vendor advisory for mitigations.

References

• https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0085411
• https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0085411

Get alerted when CVE-2020-4126 or the next vulnerability affects your stack