CVE-2026-126133
Calendar server credentials could be sent to an HTTP proxy
Description
When a CalDAV or ICS calendar was accessed through an HTTP proxy that requested authentication, Thunderbird could answer the proxy with the calendar server's username and password. This affected both setting up a new calendar and syncing existing calendars, where a saved password could be sent without any user interaction. A malicious or compromised proxy could use this to obtain the calendar credentials, even for calendars served over HTTPS. This vulnerability was fixed in Thunderbird 160.
INFO
Published Date :
Nov. 10, 2026, 6:59 p.m.
Last Modified :
Nov. 10, 2026, 6:59 p.m.
Remotely Exploit :
No
Source :
mozilla
Solution
- Update Thunderbird to version 160 or later.
- Review and reset any compromised calendar credentials.
- Avoid using untrusted HTTP proxies for calendar access.
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