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CVE-2026-14298— Denial of service via resource exhaustion in Mattermost

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 11.9.0及之前的11.9.x版本、11.8.4及之前的11.8.x版本、11.7.7及之前的11.7.x版本和10.11.22及之前的10.11.x版本存在资源管理错误漏洞，该漏洞源于处理某些用户提供的输入时未正确限制资源消耗，可能导致已认证用户造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 9

VendorProduct Version RangeStatus
Mattermost Mattermost 11.9.0≤ 11.9.0 affected
11.8.0≤ 11.8.4 affected
11.7.0≤ 11.7.7 affected
10.11.0≤ 10.11.22 affected
11.10.0 unaffected
11.9.1 unaffected
11.8.5 unaffected
11.7.8 unaffected
… +1 more rows
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I. Basic Information for CVE-2026-14298

Vulnerability Information
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Vulnerability Title
Denial of service via resource exhaustion in Mattermost
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to properly limit resource consumption when processing certain user-supplied input, which allows an authenticated user to cause a denial of service. Mattermost Advisory ID: MMSA-2026-00713
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
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 资源管理错误漏洞
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 11.9.0及之前的11.9.x版本、11.8.4及之前的11.8.x版本、11.7.7及之前的11.7.x版本和10.11.22及之前的10.11.x版本存在资源管理错误漏洞，该漏洞源于处理某些用户提供的输入时未正确限制资源消耗，可能导致已认证用户造成拒绝服务。
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 11.9.0 ~ 11.9.0 -

II. Public POCs for CVE-2026-14298

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III. Intelligence Information for CVE-2026-14298

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IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-409

V. Comments for CVE-2026-14298

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