CVE-2026-96260— Mattermost server missing request body size limit on plugin routes allows denial of service by an authenticated user
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 versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to enforce a request body size limit during CSRF validation of plugin requests which allows an authenticated user to exhaust server memory and cause a denial of
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I. Basic Information for CVE-2026-96260
Vulnerability Information
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Vulnerability Title
Mattermost server missing request body size limit on plugin routes allows denial of service by an authenticated user
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to enforce a request body size limit during CSRF validation of plugin requests which allows an authenticated user to exhaust server memory and cause a denial of service via a large request body sent to a plugin endpoint.. Mattermost Advisory ID: MMSA-2026-00775
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 11.9.0 ~ 11.9.1 | - |
|
II. Public POCs for CVE-2026-96260
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2026-09-22 · 3 CVEs total
| CVE-2026-96259 | 5.5 MEDIUM | Mattermost server-side request forgery via OAuth endpoints configurable by a System Admini |
| CVE-2026-95666 | 4.3 MEDIUM | Unbounded post ID array in the bulk reactions endpoint allows denial of service |
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V. Comments for CVE-2026-96260
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