CVE-2026-3524— Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check
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公司的一个开源协作平台。 Mattermost存在安全漏洞，该漏洞源于授权检查失败后未停止请求处理，可能导致经过身份验证的攻击者访问、创建、下载和删除法律保留数据。
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I. Basic Information for CVE-2026-3524
Vulnerability Information
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Vulnerability Title
Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost存在安全漏洞，该漏洞源于授权检查失败后未停止请求处理，可能导致经过身份验证的攻击者访问、创建、下载和删除法律保留数据。
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 ~ 1.1.4 | - |
|
II. Public POCs for CVE-2026-3524
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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CVE-2026-18799
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CVE-2026-19076
Mattermost fails to reject OAuth application sessions in acc
Same vendor: Mattermost
-
CVE-2026-18799
Mattermost Server fails to restrict Slack import account bin -
CVE-2026-16251
Mattermost local image proxy allows server memory exhaustion -
CVE-2026-18256
Private team metadata disclosure via the team search API -
CVE-2026-18223
Mattermost invitation tokens not bound to invited email addr -
CVE-2026-19076
Mattermost fails to reject OAuth application sessions in acc
Same weakness: CWE-862
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CVE-2026-113677
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Sharkord before 0.0.26 Missing Authorization via changeLogo
V. Comments for CVE-2026-3524
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