Crafted email message incorrectly shown as being encrypted

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Summary

CVECVE-2025-26696
StatePUBLISHED
Assignermozilla
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-03-10 19:15:40 UTC
Updated2026-04-13 15:16:54 UTC
DescriptionCertain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead contained an OpenPGP signed message, were wrongly shown as being encrypted. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from ADP

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

Problem Types: CWE-290 | CWE-290 CWE-290 Authentication Bypass by Spoofing

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mozilla Thunderbird All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mozilla Thunderbird unaffected 128.8 128.* rpm Not specified
CNA Mozilla Thunderbird unaffected 136 * rpm Not specified

References

ReferenceSourceLinkTags
www.mozilla.org/security/advisories/mfsa2025-17 [email protected] www.mozilla.org Vendor Advisory
bugzilla.mozilla.org/show_bug.cgi [email protected] bugzilla.mozilla.org Issue Tracking
www.mozilla.org/security/advisories/mfsa2025-18 [email protected] www.mozilla.org Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Marcus Brinkmann (en)

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