CVE-2026-118174
Published:October 27, 2026
Updated:November 04, 2026
When a message containing an OpenPGP key attachment was displayed, Thunderbird automatically loaded the attachment's content to offer importing the key. A sender could mark the attachment as an external attachment pointing to an arbitrary URL, which Thunderbird then loaded without any user interaction, bypassing remote content blocking. On Windows, a URL pointing to an attacker-controlled network share could leak the user's NTLM credentials.
The NTLM credential leak only affects Thunderbird on Windows. On other operating systems, the issue allowed a remote request that bypassed remote content blocking. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.
Affected Packages
https://github.com/thunderbird/thunderbird-desktop.git (GITHUB):
Affected version(s) >=THUNDERBIRD_154_0b1_RELEASE <THUNDERBIRD_159_0_RELEASE || >=THUNDERBIRD_155_0b1_RELEASE <THUNDERBIRD_159_0_RELEASE || >=THUNDERBIRD_156_0b1_RELEASE <THUNDERBIRD_159_0_RELEASE || >=THUNDERBIRD_157_0b1_RELEASE <THUNDERBIRD_159_0_RELEASE || >=THUNDERBIRD_158_0b1_RELEASE <THUNDERBIRD_159_0_RELEASE || >=THUNDERBIRD_159_0b1_RELEASE <THUNDERBIRD_159_0_RELEASEFix Suggestion:
Update to version THUNDERBIRD_159_0_RELEASEhttps://github.com/thunderbird/thunderbird-desktop.git (GITHUB):
Affected version(s) >=THUNDERBIRD_78_0_1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_82_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_87_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_88_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_89_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_90_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_91_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_92_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_93_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_94_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_95_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_96_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_97_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_98_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_99_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_100_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_101_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_102_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_103_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_104_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_105_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_106_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_107_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_108_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_109_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_110_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_111_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_112_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_113_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_114_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_115_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_116_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_117_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_118_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_119_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_120_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_121_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_122_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_123_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_124_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_125_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_126_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_127_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_128_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_129_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_130_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_131_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_132_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_133_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_134_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_135_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_136_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_137_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_138_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_139_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_140_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_141_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_142_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_143_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_144_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_145_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_146_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_147_0b1_BUILD1 <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_148_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_149_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_150_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_151_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_152_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_153_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASEFix Suggestion:
Update to version THUNDERBIRD_153_6_0esr_RELEASERelated Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Inclusion of Functionality from Untrusted Control Sphere
EPSS
Base Score:
0.19