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CVE-2026-92238

Mozilla Thunderbird vulnerability

9.8 CRITICALEPSS 0.54%
  1. Published15 Sept 2026

Description

A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mozilla Thunderbird≥ 141.0 < 153.3.0 · ≥ 154.0 < 156.0 · < 140.16.0

Remediation

Fixed in
Mozilla Thunderbird≥ 153.3.0

References

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Frequently asked

Is CVE-2026-92238 being actively exploited?

CVE-2026-92238 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.54%.

How severe is CVE-2026-92238?

CVE-2026-92238 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.54% probability of exploitation.

Which products are affected by CVE-2026-92238?

Affected products include Mozilla Thunderbird.

How do I fix CVE-2026-92238?

Upgrade affected software to a fixed version, for example Mozilla Thunderbird 153.3.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-92238 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.