CVE-2026-3524
Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check
CVSS Score
8.3
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-862 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Apr 6, 2026 |
| Last Updated | Apr 7, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Mattermost / Mattermost
0 ≤ 1.1.4
Credits
Hassan Mohammed