CVE-2026-27659— CSRF vulnerability in UpdateAccessControlPolicyActiveStatus endpoint
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I. Basic Information for CVE-2026-27659
Vulnerability Information
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Vulnerability Title
CSRF vulnerability in UpdateAccessControlPolicyActiveStatus endpoint
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to properly validate CSRF tokens in the /api/v4/access_control_policies/{policy_id}/activate endpoint, which allows an attacker to trick an admin into changing access control policy active status via a crafted request.. Mattermost Advisory ID: MMSA-2026-00578
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨站请求伪造(CSRF)
Source: NVD (National Vulnerability Database)
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 11.2.2及之前的11.2.x版本、10.11.10及之前的10.11.x版本、11.4.0及之前的11.4.x版本和11.3.1及之前的11.3.x版本存在安全漏洞，该漏洞源于/api/v4/access_control_policies/{policy_id}/activate端点中CSRF令牌验证不当，可能导致攻击者诱骗管理员通过特制请求更改访问控制策略活动状态。
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 | 11.2.0 ~ 11.2.2 | - |
II. Public POCs for CVE-2026-27659
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2026-03-25 · 4 CVEs total
| CVE-2026-27656 | 5.7 MEDIUM | Account Takeover via Substring Matching in OpenID Connect Authentication |
| CVE-2026-26233 | 4.3 MEDIUM | Denial of Service via HTTP/2 single packet attack on login endpoint |
| CVE-2026-20719 | 4.3 MEDIUM | DoS via URL Previews Rendering Malicious SVGs |
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V. Comments for CVE-2026-27659
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