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CVE-2026-93846— Team admin can escalate a team member's permissions via the team member roles endpoint

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 11.7.x 至 11.7.10 版本未能限制通过 API 可分配给团队成员的内置角色，这使得团队管理员能够利用 REST API，向团队成员授予超出已配置权限方案所允许范围的权限。Mattermost 安全公告编号：MMSA-2026-00734。

CVSS 3.8 · Low EPSS 0.15% · P4

Affected Version Matrix 3

VendorProduct Version RangeStatus
Mattermost Mattermost 11.7.0≤ 11.7.10 affected
11.11.0 unaffected
11.7.11 unaffected
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I. Basic Information for CVE-2026-93846

Vulnerability Information
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Vulnerability Title
Team admin can escalate a team member's permissions via the team member roles endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.7.x <= 11.7.10 fail to restrict which built-in roles can be assigned to a team member via the API, which allows a team admin to grant a team member permissions beyond those permitted by the configured permission scheme via the {{update-team-member-roles}} REST API.. Mattermost Advisory ID: MMSA-2026-00734
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 11.7.0 ~ 11.7.10 -

II. Public POCs for CVE-2026-93846

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III. Intelligence Information for CVE-2026-93846

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Same Patch Batch · Mattermost · 2026-10-26 · 6 CVEs total

CVE-2026-116516 6.5 MEDIUM Insufficient length validation when parsing Zoom chat transcriptions
CVE-2026-93849 6.5 MEDIUM Mattermost allows authenticated users to trigger excessive memory allocation via crafted m
CVE-2026-93850 6.5 MEDIUM Unbounded memory consumption during PDF text extraction
CVE-2026-93847 3.5 LOW Improper post type validation on scheduled post endpoints
CVE-2026-93848 2.7 LOW Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allow

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-863