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CVE-2026-3116— Improper Input Validation in Zoom Plugin Webhook Handler

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 Plugins是美国Mattermost公司的一个插件，提供强大的功能延伸和与服务器和网络/桌面应用程序都紧密整合。 Mattermost Plugins 11.4及之前版本、11.0.4及之前版本、11.1.3及之前版本、11.3.2及之前版本和10.11.11.0及之前版本存在安全漏洞，该漏洞源于未验证传入请求大小，可能导致经过身份验证的攻击者通过Webhook端点造成服务中断。

CVSS 4.9 · Medium EPSS 0.44% · P37
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I. Basic Information for CVE-2026-3116

Vulnerability Information
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Vulnerability Title
Improper Input Validation in Zoom Plugin Webhook Handler
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Plugins versions <=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost Plugins 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost Plugins是美国Mattermost公司的一个插件，提供强大的功能延伸和与服务器和网络/桌面应用程序都紧密整合。 Mattermost Plugins 11.4及之前版本、11.0.4及之前版本、11.1.3及之前版本、11.3.2及之前版本和10.11.11.0及之前版本存在安全漏洞，该漏洞源于未验证传入请求大小，可能导致经过身份验证的攻击者通过Webhook端点造成服务中断。
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 0 ~ 11.0.4 -

II. Public POCs for CVE-2026-3116

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III. Intelligence Information for CVE-2026-3116

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Same Patch Batch · Mattermost · 2026-03-26 · 8 CVEs total

CVE-2026-3108 8.0 HIGH Terminal Escape Injection in mmctl Report Posts Command
CVE-2026-3112 6.8 MEDIUM Arbitrary File Read via Advanced Logging Support Packet
CVE-2026-3114 6.5 MEDIUM Zip Bomb Denial of Service via Unrestricted Archive Decompression
CVE-2026-4274 5.4 MEDIUM Insufficient authorization in shared channel membership sync grants team-level access inst
CVE-2026-3113 5.0 MEDIUM mmctl export download command doesn’t restrict permissions to created file to file owner
CVE-2026-3115 4.3 MEDIUM Guest users can view group member IDs without respecting view restrictions
CVE-2026-3109 2.2 LOW Missing timestamp validation in Zoom webhook handler

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-400

V. Comments for CVE-2026-3116

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