Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00026.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Mattermost Mattermost unaffected
Version Status Constraints
11.1.0 affected ≤ 11.1.2
10.11.0 affected ≤ 10.11.9
11.2.0 affected ≤ 11.2.1
11.3.0 unaffected —
11.1.3 unaffected —
10.11.10 unaffected —
11.2.2 unaffected —

No data.

No data.

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Vendors Products
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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

Update Mattermost to versions 11.3.0, 11.1.3, 10.11.10, 11.2.2 or higher. Alternatively, update Mattermost Zoom Plugin to version 1.12.0 or higher

Workaround

No workaround given by the vendor.

References
Link Providers
https://mattermost.com/security-updates cve-icon cve-icon
History

Mon, 16 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Mon, 16 Feb 2026 10:15:00 +0000

Type Values Removed Values Added
Description Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534
Title Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-02-16T09:54:24.732Z

Reserved: 2026-01-15T15:58:22.233Z

Link: CVE-2026-0998

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-02-16T10:16:07.983

Modified: 2026-02-16T10:16:07.983

Link: CVE-2026-0998

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-16T12:00:57Z

Weaknesses