Medium severity · published Mar 24, 2026
CVE-2026-21790
HCL Traveler is susceptible to a weak default HTTP header validation vulnerability
6.3
CVSS
0.2%
EPSS
No
On KEV
Description
HCL Traveler is susceptible to a weak default HTTP header validation vulnerability, which could allow an attacker to bypass additional authentication checks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TR
Traveler · HCLSoftware
< 14.5.1.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21790
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21790
support.hcl-software.com
https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0129139
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