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Description

Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.

PUBLISHED Reserved 2025-08-15 | Published 2025-09-15 | Updated 2025-09-15 | Assigner Mattermost




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Problem types

CWE-862: Missing Authorization

Product status

Default status
unaffected

10.10.0 (semver)
affected

10.11.0
unaffected

10.10.2
unaffected

Credits

daw10 finder

References

mattermost.com/security-updates

cve.org (CVE-2025-9076)

nvd.nist.gov (CVE-2025-9076)

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