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LOW · 2.7

CVE-2026-27769

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 Wor...

Vulnerability 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

CVSS Score

2.7

LOW

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE

Affected Products

VendorProductVersions
MattermostMattermost Server>= 10.11.0, < 10.11.13

Related Weaknesses (CWE)

CWE-862

References

FAQ

What is CVE-2026-27769?

CVE-2026-27769 is a vulnerability with a CVSS score of 2.7 (LOW). 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 Wor...

How severe is CVE-2026-27769?

CVE-2026-27769 has been rated LOW with a CVSS base score of 2.7/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-27769?

Check the references section above for vendor advisories and patch information. Affected products include: Mattermost Mattermost Server.