CVE-2024-21848— Users maintain access to active call after being removed from a channel
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 Server是美国Mattermost公司的一套开源的消息传递平台。 Mattermost Server 8.1.x版本至8.1.11之前版本存在安全漏洞，该漏洞源于访问控制不正确。
Possible ATT&CK Techniques 1 AI
T1133 · External Remote Services
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I. Basic Information for CVE-2024-21848
Vulnerability Information
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Vulnerability Title
Users maintain access to active call after being removed from a channel
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Access Control in Mattermost Server versions 8.1.x before 8.1.11 allows an attacker that is in a channel with an active call to keep participating in the call even if they are removed from the channel
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost Server是美国Mattermost公司的一套开源的消息传递平台。 Mattermost Server 8.1.x版本至8.1.11之前版本存在安全漏洞，该漏洞源于访问控制不正确。
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 | 8.1.0 ~ 8.1.10 | - |
|
II. Public POCs for CVE-2024-21848
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · Mattermost · 2024-04-05 · 4 CVEs total
| CVE-2024-2447 | 6.5 MEDIUM | Mattermost 安全漏洞 |
| CVE-2024-29221 | 4.7 MEDIUM | Invite ID available to team admins even without the "Add Members" permission |
| CVE-2024-28949 | 4.3 MEDIUM | DoS via a large number of User Preferences |
IV. Related Vulnerabilities
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CVE-2026-12284
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Same vendor: Mattermost
-
CVE-2026-96260
Mattermost server missing request body size limit on plugin -
CVE-2026-96259
Mattermost server-side request forgery via OAuth endpoints c -
CVE-2026-95666
Unbounded post ID array in the bulk reactions endpoint allow -
CVE-2026-12284
Mattermost Desktop App Missing IPC Sender Validation in Call -
CVE-2026-75588
Mattermost Desktop App plugin popout scheme validation bypas
Same weakness: CWE-284
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V. Comments for CVE-2024-21848
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