Mattermost Desktop App patches multiple flaws
Mattermost Desktop App versions before 6.2.3 contain multiple vulnerabilities that can expose data confidentiality, patches available.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
ANSSI (CERT-FR) issued an advisory covering multiple vulnerabilities in the Mattermost Desktop App affecting versions prior to 6.2.3. The flaws can lead to a breach of data confidentiality and an additional security issue not further specified by the vendor. Mattermost published four security bulletins (MMSA-2026-00698, 00699, 00716, 00717) on 17 August 2026 detailing the fixes, with one tracked vulnerability assigned CVE-2026-75587.
There is no indication in the advisory of active exploitation in the wild; this is a routine vendor patch notice distributed by the French national CERT. Organizations using Mattermost Desktop App should update to version 6.2.3 or later as recommended in the vendor's security updates page to mitigate potential confidentiality risks.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1040
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