CVE-2025-25279

安全公告 MMSA-2025-00430 / CVE-2025-25279 摘要 在将文件上传到 Mattermost 看板后，当修改 fileId 参数并复制看板时，文件现在指向并下载参数中指定的目标文件。 受影响版本： 启用了看板的 Mattermost 实例 CVE： CVE-2025-25279 描述 Mattermost 版本 10.4.x = 10.4.1、9.11.x = 9.11.7、10.3.x = 10.3.2、10.2.x = 10.2.2 未能正确验证导入看板时的看板块，导致攻击者可以通过导入和导出特制的导入归档文件来读取系统上的任意文件。 截图...

EUVD-2026-78160

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7, 10.11.x = 10.11.22 Fail to sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team's secret...

CVE-2026-91181

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7, 10.11.x = 10.11.22 Fail to sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team's secret...

CVE-2026-91181 Data Retention Teams Endpoint Leaks Private Team Invite ID

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7, 10.11.x = 10.11.22 Fail to sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team's secret...

CVE-2026-91181

CVE-2026-91181 affects Mattermost versions 11.9.0 and earlier, 11.8.4 and earlier, 11.7.7 and earlier, and 10.11.22 and earlier. The data retention teams endpoint (GET /api/v4/data_retention/policies/{policy_id}/teams) fails to sanitize Team objects, allowing an authenticated user with only the r...

CVE-2026-12985

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7 Mattermost failed to validate Dynamic Client Registration redirect URIs by URL component matching glob patterns against the raw URI string instead which allows a remote unauthenticated attacker to register an OAuth client with ...

CVE-2026-86348

Mattermost versions =11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701...

CVE-2026-86349

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.8, 10.11.x = 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service CPU resource exhaustion via a crafted post containing deeply nested...

CVE-2026-82920

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7 fail to enforce authorization boundaries on the access control policy update endpoint which allows a channel or team administrator to detach a system-assigned ABAC parent policy via a crafted PUT /api/v4/accesscontrolpolicies...

CVE-2026-12985 Mattermost DCR redirect URI allowlist bypass via improper URL component validation

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7 Mattermost failed to validate Dynamic Client Registration redirect URIs by URL component matching glob patterns against the raw URI string instead which allows a remote unauthenticated attacker to register an OAuth client with ...

EUVD-2026-77520

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7 Mattermost failed to validate Dynamic Client Registration redirect URIs by URL component matching glob patterns against the raw URI string instead which allows a remote unauthenticated attacker to register an OAuth client with ...

CVE-2026-12985

Mattermost versions 11.9.0 and earlier , 11.8.4 and earlier , and 11.7.7 and earlier contain a flaw in Dynamic Client Registration (DCR) redirect URI validation . The application matches configured glob patterns against the raw URI string rather than individual URL components, allowing a remote u...

CVE-2026-82920 Mattermost ABAC parent policy bypass via policy update endpoint

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7 fail to enforce authorization boundaries on the access control policy update endpoint which allows a channel or team administrator to detach a system-assigned ABAC parent policy via a crafted PUT /api/v4/accesscontrolpolicies...

CVE-2026-82920

Mattermost versions 11.9.x ≤ 11.9.0 , 11.8.x ≤ 11.8.4 , and 11.7.x ≤ 11.7.7 fail to enforce authorization boundaries on the ABAC policy update endpoint. A channel or team administrator can detach a system-assigned ABAC parent policy by sending a crafted PUT /api/v4/access_control_policies request...

EUVD-2026-77487

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.7 fail to enforce authorization boundaries on the access control policy update endpoint which allows a channel or team administrator to detach a system-assigned ABAC parent policy via a crafted PUT /api/v4/accesscontrolpolicies...

CVE-2026-86348 MS Calendar plugin: unrecovered handler panics from malformed post-action requests could crash the plugin process

Mattermost versions =11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701...

EUVD-2026-77481

Mattermost versions =11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701...

CVE-2026-86348

CVE-2026-86348 affects the MS Calendar plugin for Mattermost (versions ≤11.9, 11.0.9, 11.4.8, 11.7.7, and 10.22.11.0). The plugin fails to recover from handler panics triggered by a post-action request containing an unexpected field type , allowing an authenticated user to crash the plugin proces...

EUVD-2026-77480

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.8, 10.11.x = 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service CPU resource exhaustion via a crafted post containing deeply nested...

CVE-2026-86349 Mattermost Server Algorithmic DoS via Unbounded Markdown Block Nesting

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.8, 10.11.x = 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service CPU resource exhaustion via a crafted post containing deeply nested...