CVE-2026-118175
Published:October 27, 2026
Updated:November 02, 2026
When replying to, forwarding, or editing a crafted email message as new, Thunderbird could embed parts of a different message stored in the same folder into the message being composed, without showing a blocked content warning. If the user sent the message, the content of the other message was disclosed to the recipients. 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_60_0_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_68_0b1_RELEASE <THUNDERBIRD_153_6_0esr_RELEASE || >=THUNDERBIRD_78_0b1_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:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
EPSS
Base Score:
0.18