CVE-2026-113866

When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerabilit...

CVE-2026-113866

A flaw was found in Thunderbird. An information disclosure issue occurs during account setup when the Exchange AutoDiscover feature transmits requests over unencrypted Hypertext Transfer Protocol HTTP. A network attacker monitoring traffic can intercept these plaintext requests, exposing the user...

CVE-2026-113866 Account password sent unencrypted during Exchange account setup

When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerabilit...

EUVD-2026-105293

When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerabilit...

CVE-2026-113866

Thunderbird is vulnerable to an issue where account passwords are sent unencrypted during the Exchange account setup . The Exchange AutoDiscover lookup process erroneously queries the domain's AutoDiscover service over plain HTTP , including the user's entered credentials in the unencrypted reque...

Security Vulnerabilities fixed in Thunderbird 158.0.1 — Mozilla

When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. Thunderbird did n...

Security Vulnerabilities fixed in Thunderbird 153.5.1 — Mozilla

When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. Thunderbird did n...

"Warning: Exchange account was not found"

Challenge When backing up Exchange Online mailboxes, Veeam Backup for Microsoft 365 intermittently fails to discover and process some mailboxes, reporting the following warning: Warning: Exchange account was not found The affected mailboxes vary between job runs, and in some cases, only a small...