Cleartext Transmission of Sensitive Information Affecting thunderbird package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.24% (16th percentile)

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  • Snyk IDSNYK-RHEL10-THUNDERBIRD-22438279
  • published12 Nov 2026
  • disclosed11 Nov 2026

Introduced: 11 Nov 2026

NewCVE-2026-126136  (opens in a new tab)
CWE-319  (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.

For Exchange accounts using EWS or Microsoft Graph with OAuth2 authentication, Thunderbird sent the OAuth2 access token to the server even when the configured server URL used unencrypted HTTP. An attacker able to observe network traffic could obtain the token and use it to access the user's mailbox until the token expired. An attacker positioned on the network during account setup could cause such a URL to be configured. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7.

CVSS Base Scores

version 3.1