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VULNERABILITIES

CVE-2026-113866 Details

Description

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 vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2080121 [email protected]
https://www.mozilla.org/security/advisories/mfsa2026-114/ [email protected]
https://www.mozilla.org/security/advisories/mfsa2026-115/ [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-523Unprotected Transport of CredentialsCISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-113866
NVD Published Date:
Oct 20, 2026
NVD Last Modified:
Oct 22, 2026
Source:
[email protected]