CVE-2026-21790 HCL Traveler is susceptible to a weak default HTTP header validation vulnerability
Attackers can bypass authentication checks in HCL Traveler due to weak default HTTP header validation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21790?
CVE-2026-21790 is a medium-severity authentication bypass vulnerability in HCLSoftware Traveler, published on 24 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
HCL Traveler is susceptible to a weak default HTTP header validation vulnerability, which could allow an attacker to bypass additional authentication checks.
Weakness: CWE-346
Which versions are affected by CVE-2026-21790?
How do I fix CVE-2026-21790?
No fix has been published for CVE-2026-21790 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-21790 being exploited?
There is no known exploitation of CVE-2026-21790 in the wild and no public exploit code.
Sources
Also known as GHSA-mr94-p7f2-xw23.