Multiple Vulnerabilities in Mattermost Desktop App
Summary
CERT-FR published security advisory CERTFR-2026-AVI-0419 alerting to multiple vulnerabilities in Mattermost Desktop App affecting versions prior to 5.13.5.0. The vulnerabilities could allow an attacker to cause unspecified security issues. Organizations using Mattermost Desktop App should consult the vendor security bulletins and apply available patches.
What changed
CERT-FR published security advisory CERTFR-2026-AVI-0419 alerting to multiple vulnerabilities in Mattermost Desktop App affecting versions prior to 5.13.5.0. The vulnerabilities were disclosed via Mattermost security bulletins MMSA-2026-00618 and MMSA-2026-00633 dated April 9, 2026. No specific technical details of the vulnerabilities were disclosed by the editor.
Organizations using Mattermost Desktop App should immediately identify affected installations, review the vendor security bulletins, and apply available patches to prevent potential exploitation. This advisory affects any organization deploying Mattermost's desktop client for team communications.
What to do next
- Identify Mattermost Desktop App versions in use and verify if affected
- Apply vendor security patches by updating to version 5.13.5.0 or later
- Monitor Mattermost security updates for additional patch information
Archived snapshot
Apr 10, 2026GovPing 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 10 avril 2026 N° CERTFR-2026-AVI-0419 Affaire suivie par: CERT-FR
Avis du CERT-FR
Objet: Multiples vulnérabilités dans Mattermost Desktop App
Gestion du document
| Référence | CERTFR-2026-AVI-0419 |
| Titre | Multiples vulnérabilités dans Mattermost Desktop App |
| Date de la première version | 10 avril 2026 |
| Date de la dernière version | 10 avril 2026 |
| Source(s) | Bulletin de sécurité Mattermost MMSA-2026-00618 du 09 avril 2026
Bulletin de sécurité Mattermost MMSA-2026-00633 du 09 avril 2026 |
Une gestion de version détaillée se trouve à la fin de ce document.
Risque
- Non spécifié par l'éditeur
Systèmes affectés
- Mattermost Desktop App versions antérieures à 5.13.5.0
Résumé
De multiples vulnérabilités ont été découvertes dans Mattermost Desktop App. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Documentation
- Bulletin de sécurité Mattermost MMSA-2026-00618 du 09 avril 2026
- https://mattermost.com/security-updates/
- Bulletin de sécurité Mattermost MMSA-2026-00633 du 09 avril 2026
- https://mattermost.com/security-updates/
Gestion détaillée du document
- le 10 avril 2026 Version initiale
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