CVE-2026-3116— Improper Input Validation in Zoom Plugin Webhook Handler
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
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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|---|
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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
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Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same vendor: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-400
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FastGPT: Uncontrolled Resource Consumption leading to Sandbo - CVE-2026-42212
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Unbounded exponent in decimal enables unauthenticated DoS - CVE-2026-20188
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CoreDNS DoH GET path missing size validation causes CPU and
V. Comments for CVE-2026-3116
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