Is CVE-2026-27769 actively exploited?

CVE-2026-27769 has no public evidence of in-the-wild exploitation as of 2026-04-22.

What is the CVSS score for CVE-2026-27769?

CVE-2026-27769 has a CVSS score of 2.7 (LOW severity). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N.

How do I patch CVE-2026-27769?

Patch guidance is available from mattermost security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-27769.

Which products are affected by CVE-2026-27769?

1 product: mattermost mattermost server.

CVE-2026-27769 - remediation guidance & executive summary

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: high
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: CWE-862 · Missing Authorization

Metadata

Primary Vendor: MATTERMOST
Published: 4/15/2026
Last Modified: 4/22/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

mattermost : mattermost_server

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-27769. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-27769

View on NIST NVD

CVE-2026-27769 vulnerability