What is the severity of MFSA2025-23?

MFSA2025-23 includes security vulnerabilities that have been classified as critical.

What vulnerabilities are addressed in the MFSA2025-23 advisory?

MFSA2025-23 addresses multiple security vulnerabilities impacting Thunderbird versions prior to 137.

How do I fix MFSA2025-23?

To fix MFSA2025-23, update your Thunderbird to version 137 or later.

Who is affected by MFSA2025-23?

Users of Thunderbird versions below 137 are affected by the vulnerabilities listed in MFSA2025-23.

Is it safe to continue using Thunderbird before updating for MFSA2025-23?

It is not safe to continue using vulnerable versions of Thunderbird before applying the updates recommended in MFSA2025-23.

Vulnerability/
MFSA2025-23

high

1/4/2025

MFSA2025-23: Security Vulnerabilities fixed in Thunderbird 137

First published: Tue Apr 01 2025(Updated: )

Security Vulnerabilities fixed in Thunderbird 137

Affected Software	Affected Version	How to fix
Thunderbird	<137	137

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Reference Links

https://www.mozilla.org/en-US/security/advisories/mfsa2025-23/ (Advisory)

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

What is the severity of MFSA2025-23?
MFSA2025-23 includes security vulnerabilities that have been classified as critical.
What vulnerabilities are addressed in the MFSA2025-23 advisory?
MFSA2025-23 addresses multiple security vulnerabilities impacting Thunderbird versions prior to 137.
How do I fix MFSA2025-23?
To fix MFSA2025-23, update your Thunderbird to version 137 or later.
Who is affected by MFSA2025-23?
Users of Thunderbird versions below 137 are affected by the vulnerabilities listed in MFSA2025-23.
Is it safe to continue using Thunderbird before updating for MFSA2025-23?
It is not safe to continue using vulnerable versions of Thunderbird before applying the updates recommended in MFSA2025-23.

collector/mozilla-advisory
source/Mozilla
agent/software-canonical-lookup
agent/title
agent/last-modified-date
agent/references
agent/tags
agent/severity
agent/softwarecombine
agent/description
agent/type
agent/first-publish-date
agent/source
agent/event
vendor/mozilla
canonical/thunderbird

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Frequently Asked Questions

What is the severity of MFSA2025-23?
MFSA2025-23 includes security vulnerabilities that have been classified as critical.
What vulnerabilities are addressed in the MFSA2025-23 advisory?
MFSA2025-23 addresses multiple security vulnerabilities impacting Thunderbird versions prior to 137.
How do I fix MFSA2025-23?
To fix MFSA2025-23, update your Thunderbird to version 137 or later.
Who is affected by MFSA2025-23?
Users of Thunderbird versions below 137 are affected by the vulnerabilities listed in MFSA2025-23.
Is it safe to continue using Thunderbird before updating for MFSA2025-23?
It is not safe to continue using vulnerable versions of Thunderbird before applying the updates recommended in MFSA2025-23.