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CVE-2026-9162— Global session revocation does not invalidate active WebSocket connections

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公司开源的一个开源协作平台。 Mattermost存在会话机制问题漏洞，该漏洞源于全局会话撤销期间未能使活动WebSocket连接的缓存认证状态失效，可能导致拥有现有WebSocket连接的用户保持认证并继续接收实时事件。

CVSS 4.3 · Medium EPSS 0.33% · P25

Affected Version Matrix 9

VendorProduct Version RangeStatus
Mattermost Mattermost 11.7.0≤ 11.7.0 affected
11.6.0≤ 11.6.2 affected
11.5.0≤ 11.5.5 affected
10.11.0≤ 10.11.17 affected
11.8.0 unaffected
11.7.1 unaffected
11.6.3 unaffected
11.5.6 unaffected
… +1 more rows
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I. Basic Information for CVE-2026-9162

Vulnerability Information
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Vulnerability Title
Global session revocation does not invalidate active WebSocket connections
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state for active WebSocket connections during global session revocation, which allows a user with an existing WebSocket connection to remain authenticated and continue receiving real-time events until the cached session expires or the client reconnects.. Mattermost Advisory ID: MMSA-2026-00664
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的会话过期机制
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 会话机制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司开源的一个开源协作平台。 Mattermost存在会话机制问题漏洞，该漏洞源于全局会话撤销期间未能使活动WebSocket连接的缓存认证状态失效，可能导致拥有现有WebSocket连接的用户保持认证并继续接收实时事件。
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 11.7.0 ~ 11.7.0 -

II. Public POCs for CVE-2026-9162

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III. Intelligence Information for CVE-2026-9162

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Same Patch Batch · Mattermost · 2026-06-22 · 6 CVEs total

CVE-2026-6062 6.4 MEDIUM IDOR in Jira plugin subscription edit endpoint
CVE-2026-6673 6.4 MEDIUM Mattermost Jira plugin had unauthenticated {{/ac/installed}} lifecycle callback during pen
CVE-2026-5139 5.4 MEDIUM GitLab Plugin Allows Non-Admin Users to Modify Default Instance Configuration
CVE-2026-8823 3.8 LOW User Manager can demote bot accounts to guest without bot-management permission
CVE-2026-8074 3.8 LOW Improper Permission Check Allows User Manager to Deactivate Bot Accounts

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-613

V. Comments for CVE-2026-9162

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