Is CVE-2026-21783 in the CISA KEV catalog?

No. CVE-2026-21783 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-21783?

CVE-2026-21783 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-21783?

CVE-2026-21783 has an EPSS score of 0.28% (20th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21783?

Upgrade traveler to 14.5.1.0 or later.

CVE & CISA-KEV Catalog

CVE-2026-21783

MEDIUM

4.3

CVSS v3

NVD

Description

HCL Traveler is affected by sensitive information disclosure. The application generates some error messages that provide detailed information about errors and failures, such as internal paths, file names, sensitive tokens, credentials, error codes, or stack traces. Attackers could exploit this information to gain insights into the system's architecture and potentially launch targeted attacks.

CWE-209

How to fix

Remediation Available

travelerNVD

Affected:< 14.5.1.0Fixed in:14.5.1.0CVE-2026-21783derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

0.28%probability of exploitation in 30 days

20thpercentile

Low risk: more likely to be exploited than 20% of all known CVEs.

References

Vendor Advisory1

support.hcl-software.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-31.