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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-126136

OAuth2 access token could be sent over an unencrypted connection with Exchange accounts

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Status
Published
Published
Updated
Assigning organization
mozilla

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Thunderbird

  • 153.7 to ≤ 153.*unaffected
  • 160 to ≤ *unaffected

References