CVE WatchNov 4, 2026

CVE-2026-118177

When looking for calendars in a directory on a server, during account setup or when adding a new network calendar, Thunderbird accepted cale

CVSS

9.1

Critical

EPSS

0.5%

p39

KEV

—

Exploit Today

0-100

Published: Oct 27, 2026 · Last modified: Nov 4, 2026 · CWE-601

EPSS · 30d

0.2%EPSS · 30 days0.5%

2026-10-282026-11-07

Technical description

When looking for calendars in a directory on a server, during account setup or when adding a new network calendar, Thunderbird accepted calendar locations pointing to other servers, local files or network shares. A malicious server, or a network attacker when the lookup used plain HTTP, could make Thunderbird subscribe to such a location. On Windows this could leak the user's NTLM credentials to an attacker-controlled host on every calendar refresh, and changes to the calendar could be written to the attacker's share or overwrite a local file. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.

Official references

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