Information Exposure Affecting thunderbird package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.21% (12th percentile)

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  • Snyk IDSNYK-RHEL10-THUNDERBIRD-22438145
  • published12 Nov 2026
  • disclosed10 Nov 2026

Introduced: 10 Nov 2026

NewCVE-2026-126133  (opens in a new tab)
CWE-201  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 thunderbird.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

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 and Thunderbird 153.7.

CVSS Base Scores

version 3.1