CVE-2025-20036— Insufficient Input Validation on Post Props
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 Mobile Apps是美国Mattermost公司的一款消息传递移动应用程序。 Mattermost Mobile Apps 2.22.0版本存在安全漏洞，该漏洞源于无法正确验证帖子属性，会导致经过身份验证的恶意用户通过恶意帖子导致系统崩溃。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-20036
Vulnerability Information
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Vulnerability Title
Insufficient Input Validation on Post Props
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Mobile Apps versions <=2.22.0 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
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
CWE-1287
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost Mobile Apps 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost Mobile Apps是美国Mattermost公司的一款消息传递移动应用程序。 Mattermost Mobile Apps 2.22.0版本存在安全漏洞，该漏洞源于无法正确验证帖子属性，会导致经过身份验证的恶意用户通过恶意帖子导致系统崩溃。
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 ~ 2.22.0 | - |
|
II. Public POCs for CVE-2025-20036
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-01-15 · 6 CVEs total
| CVE-2025-21088 | 6.5 MEDIUM | WebApp crash via improper validation of proto style in attachments |
| CVE-2025-21083 | 6.5 MEDIUM | Insufficient Input Validation on Post Props |
| CVE-2025-20086 | 6.5 MEDIUM | Insufficient Input Validation on Post Props |
| CVE-2025-20088 | 6.5 MEDIUM | Insufficient Input Validation on Post Props |
| CVE-2025-0476 | 4.3 MEDIUM | Mobile crash via file with specially crafted filename |
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Same vendor: Mattermost
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CVE-2026-75587
Plaintext pre-auth secret exposure via Desktop App diagnosti -
CVE-2026-9693
Mattermost thread memberships persist after team removal, ex -
CVE-2026-9859
Mattermost Boards plugin didn’t enforce role-based authoriza -
CVE-2026-9816
Insufficient server-side validation of board member role fie -
CVE-2026-10080
Boards plugin panics on WebSocket command with non-string fi
V. Comments for CVE-2025-20036
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