VulnerabilityPublished 24 Mar 2026

CVE-2026-21783: HCLSoftware Traveler · Generation of error message containing sensitive information

Affects HCLSoftware TravelerSource CVE Database V5

Compare

Not known to be exploited · CVSS 4.3 Medium : upgrade to 14.5.1.0 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 14.5.1.0

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade HCLSoftware Traveler to 14.5.1.0.

Affected software

Product	Affected	Fixed in
HCLSoftwareTraveler	Affected <14.5.1.0	Fixed in 14.5.1.0

AI-suggested

To mitigate this vulnerability, organizations should upgrade HCL Traveler to version 14.5.1.0 or later where the issue is resolved. In addition, administrators should review and harden error handling configurations to ensure that error messages do not expose sensitive internal details. This includes disabling verbose error reporting in production environments and implementing centralized logging with controlled access. Network segmentation and strict access controls should be enforced to limit exposure of the Traveler application to trusted users only. Regular security assessments and code reviews focusing on error handling can help identify similar issues. Monitoring logs for unusual error message patterns may also help detect exploitation attempts. Finally, educating developers and administrators about secure coding and error management best practices will reduce the risk of future information disclosure vulnerabilities.

Description

CVE-2026-21783 is a medium-severity vulnerability in HCLSoftware Traveler versions prior to 14.5.1.0, where error messages disclose sensitive information such as internal paths, file names, tokens, credentials, error codes, or stack traces. This information disclosure can aid attackers in understanding system architecture and crafting targeted attacks. The vulnerability does not require user interaction but does require some level of privileges (PR:L). There are no known exploits in the wild currently. The CVSS score is 4.3, reflecting limited confidentiality impact without direct integrity or availability effects. Organizations using affected versions should update to 14.

Impact

The primary impact of this vulnerability is the disclosure of sensitive information that can aid attackers in understanding the internal architecture and security mechanisms of HCL Traveler deployments. While it does not directly compromise system integrity or availability, the leaked information can be used to craft more effective attacks such as privilege escalation, lateral movement, or exploitation of other vulnerabilities. Organizations using affected versions may face increased risk of targeted attacks, especially if attackers combine this information with other reconnaissance data. The confidentiality breach could expose sensitive tokens or credentials, potentially leading to unauthorized access if combined with other weaknesses. The impact is more significant in environments where Traveler is integrated with critical business communications or sensitive data workflows.

CWE-209Generation of Error Message Containing Sensitive Information (opens in a new tab)
Base weaknessLikelihood of exploit: HighOWASP Top 10 A10:2025: Mishandling of Exceptional Conditions (opens in a new tab)
The product generates an error message that includes sensitive information about its environment, users, or associated data.
Implementation
Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended).
Implementation
Handle exceptions internally and do not display errors containing potentially sensitive information to a user.
Implementation · Attack Surface Reduction
Use naming conventions and strong types to make it easier to spot when sensitive data is being used. When creating structures, objects, or other complex entities, separate the sensitive and non-sensitive data as much as possible.
OWASP Cheat Sheets
Error Handling (opens in a new tab)
Logging (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.4 (opens in a new tab)
V14.3.3 (opens in a new tab)
V7.3.3 (opens in a new tab)
Attack patterns
Fuzzing for application mapping (opens in a new tab)
Padding Oracle Crypto Attack (opens in a new tab)
Query System for Information (opens in a new tab)
Blind SQL Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0129139 (opens in a new tab)

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 31 Mar 2026, 20:32 UTC

WeaknessesCWE-209

Technical details

References

Community reviews

Related threats