What is CVE-2026-21790?

CVE-2026-21790 is a medium-severity vulnerability in Hclsoftware Traveler, classified under Origin Validation Error. CVSS score: 6.3/10. Published 2026-03-24.

How severe is CVE-2026-21790?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Hclsoftware Traveler

CVE-2026-21790

HCL Traveler is susceptible to a weak default HTTP header validation vulnerability, which could allow an attacker to bypass additional authentication checks.

EPSS: 0.000 (0.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Hclsoftware Traveler — versions < 14.5.1.0

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

support.hcl-software.com/csm

Frequently asked questions

What is CVE-2026-21790?: CVE-2026-21790 is a medium-severity vulnerability in Hclsoftware Traveler, classified under Origin Validation Error. CVSS score: 6.3/10. Published 2026-03-24.
How severe is CVE-2026-21790?: Medium severity. CVSS v3 base score is 6.3 out of 10.