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CVE-2025-26696

Crafted email message incorrectly shown as being encrypted

HIGH
7
CVSS Score
Published: March 10, 2025 at 06:41 PM UTC
Updated: June 17, 2026 at 09:02 AM UTC
1 product affected across 1 vendorThunderbird

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Severity
HIGH7
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Certain 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 affects Thunderbird < 136 and Thunderbird < 128.8.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Thunderbird· Mozilla
95%
v < 128.8.0129.0 ≤ v < 136.0
Vendor states this is fixed in 128.8 (unaffected)
Affected range stops below 128.8.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 136 (unaffected)
Affected range stops below 136.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Issue Tracking
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1864205
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-17/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-18/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-290

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