CVE-2026-27769 | THREATINT

Description

Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces feature to change the displayed status of local users via the Connected Workspaces API.. Mattermost Advisory ID: MMSA-2026-00603

PUBLISHED Reserved 2026-03-16 | Published 2026-04-15 | Updated 2026-04-15 | Assigner Mattermost

LOW: 2.7CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-862: Missing Authorization

Product status

Default status

unaffected

10.11.0 (semver)

affected

11.5.0

unaffected

10.11.13

unaffected

Credits

daw10 finder

References

mattermost.com/security-updates (MMSA-2026-00603) vendor-advisory

cve.org (CVE-2026-27769)

nvd.nist.gov (CVE-2026-27769)

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