What is CVE-2026-21788?

CVE-2026-21788 is a medium-severity vulnerability in Hclsoftware Connections, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-19.

How severe is CVE-2026-21788?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Hclsoftware Connections

CVE-2026-21788

HCL Connections is vulnerable to a cross-site scripting attack where an attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user which leads to executing malicious script code. This may allo…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (16.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Hclsoftware Connections — versions 8

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

support.hcl-software.com/csm

Frequently asked questions

What is CVE-2026-21788?: CVE-2026-21788 is a medium-severity vulnerability in Hclsoftware Connections, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-19.
How severe is CVE-2026-21788?: Medium severity. CVSS v3 base score is 5.4 out of 10.