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CVE-2026-0998— Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls

Quick assessment

Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11.1.2及之前的11.1.x版本、10.11.9及之前的10.11.x版本、11.2.1及之前的11.2.x版本和Mattermost Plugin Zoom 1.11.0及之前版本存在安全漏洞，该漏洞源于/api/v1/askPMI端点未验证用户身份和帖子所有权，可能允许未经授权的用户以任何用户身份启动Zoom会议，并通过带有被操纵用户ID和帖子数据的直接API调用覆盖任意帖子。

CVSS 4.3 · Medium EPSS 0.16% · P4
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I. Basic Information for CVE-2026-0998

Vulnerability Information
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Vulnerability Title
Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11.1.2及之前的11.1.x版本、10.11.9及之前的10.11.x版本、11.2.1及之前的11.2.x版本和Mattermost Plugin Zoom 1.11.0及之前版本存在安全漏洞，该漏洞源于/api/v1/askPMI端点未验证用户身份和帖子所有权，可能允许未经授权的用户以任何用户身份启动Zoom会议，并通过带有被操纵用户ID和帖子数据的直接API调用覆盖任意帖子。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 11.1.0 ~ 11.1.2 -

II. Public POCs for CVE-2026-0998

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III. Intelligence Information for CVE-2026-0998

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Same Patch Batch · Mattermost · 2026-02-16 · 7 CVEs total

CVE-2026-1046 7.6 HIGH Arbitrary application execution via unvalidated server-controlled URLs in Help menu
CVE-2025-13821 5.7 MEDIUM User profile update exposes password hash and MFA secrets
CVE-2026-0999 5.4 MEDIUM Authentication bypass via userID login when email and username login are disabled
CVE-2025-14350 4.3 MEDIUM Information disclosure via channel mentions in posts
CVE-2026-0997 4.3 MEDIUM Mattermost Zoom Plugin channel preference API lacks authorization checks
CVE-2025-14573 3.8 LOW Team Admin Bypass of Invite Permissions via allow_open_invite Field

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-862

V. Comments for CVE-2026-0998

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