# Multiples vulnérabilités dans Mattermost Server (23 septembre 2026)

Publisher-attributed story with a reviewed brief or permitted publisher paragraph. The original publisher is responsible for the linked reporting.

- Publisher: CERT-FR / ANSSI
- Category: Vulnerabilities
- Original publication time: 2026-09-23T00:00:00Z
- First observed by NexusTechWire: 2026-10-01T20:28:40Z
- Original source: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1212/
- NexusTechWire record: https://nexustechwire.com/news/news-34279272941ce33d1d4e

## The brief

CERT-FR has grouped several Mattermost Server flaws that can disrupt service remotely or expose confidential data. The affected branches are 11.7 before 11.7.11, 11.8 before 11.8.6, 11.9 before 11.9.2 and 11.10 before 11.10.2. Its September 23 advisory links Mattermost's security-update notices for the corresponding fixes and identifies three associated CVEs.

AI-assisted NexusTechWire summary, checked against the linked source on 2026-10-01T21:18:05Z. Not independent reporting.

Source license: [Etalab Open Licence v2.0](https://www.etalab.gouv.fr/wp-content/uploads/2017/04/ETALAB-Licence-Ouverte-v2.0.pdf). Source material adapted into an original NexusTechWire brief. Original source license applies. See the attributed original source for its latest revision date. Reuse does not imply publisher endorsement.

Read the full original: [CERT-FR / ANSSI](https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1212/)

This record does not reproduce the complete article or represent independent confirmation of every source claim.