Auth bypass in Hclsoftware Connections

CVE-2026-21789

HCL Connections contains a broken access control vulnerability that may allow unauthorized user to update data in certain scenarios.

Vulnerability class: Broken Access Control

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.001 (1.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-21789: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-21789?
CVE-2026-21789 is a medium-severity vulnerability in Hclsoftware Connections, classified under Incorrect Authorization. CVSS score: 4.6/10. Published 2026-05-18.
How severe is CVE-2026-21789?
Medium severity. CVSS v3 base score is 4.6 out of 10.