HCL Traveler for Microsoft Outlook up to 3.0.15 DLL uncontrolled search path

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k2.88+

Summaryinfo

A vulnerability identified as critical has been detected in HCL Traveler for Microsoft Outlook up to 3.0.15. This vulnerability affects unknown code of the component DLL. The manipulation leads to uncontrolled search path. This vulnerability is referenced as CVE-2026-21770. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in HCL Traveler for Microsoft Outlook up to 3.0.15. It has been rated as critical. This issue affects some unknown functionality of the component DLL. The manipulation with an unknown input leads to a uncontrolled search path vulnerability. Using CWE to declare the problem leads to CWE-427. The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a DLL hijacking vulnerability which could allow an attacker to modify or replace the application with malicious content.

The advisory is shared at support.hcl-software.com. The identification of this vulnerability is CVE-2026-21770 since 01/05/2026. The exploitation is known to be difficult. An attack has to be approached locally. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1574 for this issue.

Upgrading to version 3.0.16 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-45141). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.0
VulDB Temp Score: 6.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uncontrolled search path
CWE: CWE-427 / CWE-426
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: Traveler for Microsoft Outlook 3.0.16

Timelineinfo

01/05/2026 CVE reserved
07/17/2026 +192 days Advisory disclosed
07/17/2026 +0 days VulDB entry created
07/17/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: support.hcl-software.com
Status: Confirmed

CVE: CVE-2026-21770 (🔒)
GCVE (CVE): GCVE-0-2026-21770
GCVE (VulDB): GCVE-100-379745
EUVD: 🔒

Entryinfo

Created: 07/17/2026 07:11
Updated: 07/17/2026 08:44
Changes: 07/17/2026 07:11 (54), 07/17/2026 08:44 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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