CVE-2026-9824— Remote cluster metadata enumeration via /share-channel autocomplete
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存在授权问题漏洞，该漏洞源于未在/share-channel自动补全处理程序中检查manage_shared_channels权限，允许未拥有该权限的认证用户通过斜杠命令自动补全功能枚举已配置的远程集群连接元数据。以下版本受到影响：11.7.2及之前的11.7.x版本、11.6.4及之前的11.6.x版本和10.11.19及之前的10.11.x版本。
Possible ATT&CK Techniques 1 AI
T1005 · Data from Local SystemAffected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | 11.7.0≤ 11.7.2 |
affected |
11.6.0≤ 11.6.4 |
affected | ||
10.11.0≤ 10.11.19 |
affected | ||
11.8.0 |
unaffected | ||
11.7.3 |
unaffected | ||
11.6.5 |
unaffected | ||
10.11.20 |
unaffected |
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I. Basic Information for CVE-2026-9824
Vulnerability Information
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Vulnerability Title
Remote cluster metadata enumeration via /share-channel autocomplete
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676
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
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 授权问题漏洞
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存在授权问题漏洞，该漏洞源于未在/share-channel自动补全处理程序中检查manage_shared_channels权限，允许未拥有该权限的认证用户通过斜杠命令自动补全功能枚举已配置的远程集群连接元数据。以下版本受到影响：11.7.2及之前的11.7.x版本、11.6.4及之前的11.6.x版本和10.11.19及之前的10.11.x版本。
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 ~ 11.7.2 | - |
|
II. Public POCs for CVE-2026-9824
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2026-07-13 · 10 CVEs total
| CVE-2026-6850 | 6.5 MEDIUM | Crafted message attachment causes client-side denial of service via markdown parser regex |
| CVE-2026-10106 | 6.5 MEDIUM | Unauthorized users can trigger interactive post actions in private channels via action coo |
| CVE-2026-9571 | 5.9 MEDIUM | Deactivated user accounts can continue to obtain valid OAuth access tokens via refresh tok |
| CVE-2026-9597 | 5.4 MEDIUM | Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API lo |
| CVE-2026-10085 | 5.4 MEDIUM | Ordinary group/direct message member can enable group_constrained and remove all channel p |
| CVE-2026-9708 | 4.9 MEDIUM | Incoming webhook user attribution via unvalidated webhook owner |
| CVE-2026-6541 | 4.3 MEDIUM | Unscoped updates to other playbooks' metric configuration |
| CVE-2026-10103 | 4.3 MEDIUM | Authenticated remote cluster can modify or delete posts it does not own in Mattermost Conn |
| CVE-2026-9820 | 3.8 LOW | Mattermost schemes teams endpoint exposes private team invite IDs |
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V. Comments for CVE-2026-9824
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