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Mozilla Products Vulnerabilities

Favicon for www.cert.ssi.gouv.fr CERT-FR Security Advisories
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Summary

CERT-FR has issued a security advisory regarding multiple vulnerabilities discovered in Mozilla products, including Firefox ESR, Firefox, and Thunderbird. These vulnerabilities could allow attackers to execute arbitrary code, elevate privileges, or cause a denial of service.

Published by CERT-FR on cert.ssi.gouv.fr . Detected, standardized, and enriched by GovPing. Review our methodology and editorial standards .
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What changed

The French national cybersecurity agency, CERT-FR, has issued an advisory (CERTFR-2026-AVI-0354) detailing multiple vulnerabilities found in Mozilla products. The affected versions include Firefox ESR prior to 115.34 and 140.9, Firefox prior to 149, and Thunderbird prior to 140.9 and 149. The vulnerabilities pose significant risks, including remote arbitrary code execution, privilege escalation, data confidentiality breaches, and denial of service attacks.

Users and organizations utilizing the affected Mozilla products are strongly advised to consult the provided Mozilla security advisories (mfsa2026-20 through mfsa2026-24) and apply the necessary patches immediately to mitigate these risks. Failure to update could expose systems to exploitation, leading to severe security compromises.

What to do next

  1. Update Firefox ESR to version 115.34 or later
  2. Update Firefox ESR to version 140.9 or later
  3. Update Firefox to version 149 or later
  4. Update Thunderbird to version 140.9 or later
  5. Update Thunderbird to version 149 or later

Archived snapshot

Mar 25, 2026

GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.

Premier Ministre S.G.D.S.N

Agence nationale
de la sécurité des
systèmes d'information

Paris, le 25 mars 2026 N° CERTFR-2026-AVI-0354 Affaire suivie par: CERT-FR

Avis du CERT-FR

Objet: Multiples vulnérabilités dans les produits Mozilla

Gestion du document

| Référence | CERTFR-2026-AVI-0354 |
| Titre | Multiples vulnérabilités dans les produits Mozilla |
| Date de la première version | 25 mars 2026 |
| Date de la dernière version | 25 mars 2026 |
| Source(s) | Bulletin de sécurité Mozilla mfsa2026-20 du 24 mars 2026
Bulletin de sécurité Mozilla mfsa2026-21 du 24 mars 2026
Bulletin de sécurité Mozilla mfsa2026-22 du 24 mars 2026
Bulletin de sécurité Mozilla mfsa2026-23 du 24 mars 2026
Bulletin de sécurité Mozilla mfsa2026-24 du 24 mars 2026 |
Une gestion de version détaillée se trouve à la fin de ce document.

Risques

  • Atteinte à la confidentialité des données
  • Contournement de la politique de sécurité
  • Déni de service à distance
  • Exécution de code arbitraire à distance
  • Non spécifié par l'éditeur
  • Élévation de privilèges

Systèmes affectés

  • Firefox ESR versions antérieures à 115.34
  • Firefox ESR versions antérieures à 140.9
  • Firefox versions antérieures à 149
  • Thunderbird versions antérieures à 140.9
  • Thunderbird versions antérieures à 149

Résumé

De multiples vulnérabilités ont été découvertes dans les produits Mozilla. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une élévation de privilèges et un déni de service à distance.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Documentation

Gestion détaillée du document

  1. le 25 mars 2026 Version initiale

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Source

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CERT-FR Security Advisories cert.ssi.gouv.fr/avis
Data Privacy & Cybersecurity

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Classification

Agency
CERT-FR
Published
March 25th, 2026
Instrument
Notice
Legal weight
Non-binding
Stage
Final
Change scope
Substantive
Document ID
CERTFR-2026-AVI-0354

Who this affects

Applies to
Consumers Employers Technology companies
Industry sector
5112 Software & Technology
Activity scope
Software Updates Vulnerability Management
Geographic scope
France FR

Taxonomy

Primary area
Cybersecurity
Operational domain
IT Security
Compliance frameworks
NIST CSF
Topics
Data Privacy Product Safety

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