CVE-2026-21770: 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.

mediumCVSS 6.5CVE-2026-21770

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 6.5
Published: 2026-07-17
Last updated: 2026-07-17
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-21770

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-217700.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-21770	coverage & exploitation status	NVD · CVE.org

Recent advisories for HCL Traveler for

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2025-59868: HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a sensitive data exposure vulnerab…nvd · 2026-06-27
highCVE-2023-37524: HCL Traveler for Microsoft Outlook (HTMO) is susceptible to vulnerabilities due to .NET Framew…nvd · 2026-06-27
mediumCVE-2024-23581: The HCL Traveler for Microsoft Outlook libraries are being flagged as potentially malicious so…nvd · 2026-06-26

CVE-2026-21770: 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.

Details

Exploitation outlook

Referenced CVEs

Recent advisories for HCL Traveler for

More from NVD Recent CVEs