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CVE-2025-14327VulnerabilityPublished Updated

Red Hat Security Advisory: thunderbird security update

Affects Red Hat thunderbirdSource GCVE Database

0

Mentioned vulnerabilities

Authoritative record:CVE-2025-14327· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade Red Hat thunderbird to 147.1 or 140.7 soon.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 31% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 147.1, 140.7
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade Red Hat thunderbird to 147.1 or 140.7.

Affected software

ProductAffectedFixed in
Red Hat Product Security Red HatAffected
  • >=140.0 <140.7
  • >=147.0 <147.1
  • Red Hat
  • Red Hat Enterprise Linux
  • Red Hat Enterprise Linux AppStream AUS (v.8.4)
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)
  • src
Fixed in
  • 140.7
  • 147.1

AI-suggested

Red Hat has released an official security update for Thunderbird in Red Hat Enterprise Linux 8.4 (including Advanced Mission Critical Update Support and Extended Update Support). Users should apply the Thunderbird update to version 140.7.0-1.el8_4 or later as provided by Red Hat to remediate these vulnerabilities. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official update.

Description

Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in a Red Hat Enterprise Linux 8.4 update. These include spoofing, use-after-free, memory safety bugs, sandbox escapes, information disclosure, mitigation bypass, and clickjacking issues across various components such as Downloads Panel, JavaScript engine, Graphics, IPC, Networking, DOM, and PDF Viewer. The update fixes these issues in Thunderbird ESR 140.7 and Thunderbird 147 versions.

References

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