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Mattermost

626 known vulnerabilities

21
CRITICAL
90
HIGH
384
MEDIUM
128
LOW

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mattermost server 467 mattermost 77 mattermost desktop 31 mattermost mobile 21 confluence 14 legal hold 2 focalboard 2 ms teams 2 zoom 2 playbooks 2
623 CVEs · Page 3/13
4.3
CVE-2026-26233

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to rate limit login r

4.3
CVE-2026-20719

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to prevent rendering

5.8
CVE-2026-2454

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to handle incorrectly reported array le

3.8
CVE-2026-26230

Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API e

4.3
CVE-2026-1629

Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel acces

4.3
CVE-2026-26304

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2 fail to verify run_create permission for empty playbookId, which

4.3
CVE-2026-2455

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to canonicalize IPv4-mapped IPv6 addres

4.3
CVE-2026-24692

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly enforce read permissions in

3.1
CVE-2026-22545

Mattermost versions 10.11.x <= 10.11.10 fail to validate user's authentication method when processing account auth type

4.3
CVE-2026-21386

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to use consistent error responses when

4.3
CVE-2026-4265

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to validate team-specific upload_file p

4.3
CVE-2026-2578

Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which all

7.6
CVE-2026-2476

Mattermost Plugins versions <=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with

4.3
CVE-2026-2463

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to filter invite IDs based on user perm

6.6
CVE-2026-2462

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to restrict plugin installation on CI t

4.3
CVE-2026-2461

Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modi

4.3
CVE-2026-2458

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate team membership wh

4.3
CVE-2026-2457

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to sanitize client-supplied post metada

5.3
CVE-2026-2456

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 Mattermost fails to limit the size of respon

4.3
CVE-2026-26246

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to bound memory allocation when process

4.3
CVE-2026-25783

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate User-Agent header

4.3
CVE-2026-25780

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to bound memory allocation when process

7.5
CVE-2026-24458

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly handle very long passwords,

4.6
CVE-2026-1628

Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Ma

7.6
CVE-2026-1046

Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost ser

3.8
CVE-2025-14573

Mattermost versions 10.11.x <= 10.11.9 fail to enforce invite permissions when updating team settings, which allows team

4.3
CVE-2025-14350

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership whe

5.7
CVE-2025-13821

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket

5.4
CVE-2026-0999

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate login method restri

4.3
CVE-2026-0998

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0

4.3
CVE-2026-0997

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0

4.3
CVE-2026-22892

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to validate user permissions when creati

3.1
CVE-2026-20796

Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which

7.7
CVE-2025-13523

Mattermost Confluence plugin version <1.7.0 fails to properly escape user-controlled display names in HTML template rend

6.8
CVE-2025-14435

Mattermost versions 10.11.x <= 10.11.8, 11.1.x <= 11.1.1, 11.0.x <= 11.0.6 fail to prevent infinite re-renders on API er

3.1
CVE-2025-14822

Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authentica

4.1
CVE-2025-64641

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post

4.3
CVE-2025-13767

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user ch

7.2
CVE-2025-14273

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 with the Jira plugin enab

3.9
CVE-2025-13326

Mattermost Desktop App versions <6.0.0 fail to enable the Hardened Runtime on the Mattermost Desktop App when packaged f

3.7
CVE-2025-13324

Mattermost versions 10.11.x <= 10.11.5, 11.0.x <= 11.0.4, 10.12.x <= 10.12.2 fail to invalidate remote cluster invite to

3.3
CVE-2025-13321

Mattermost Desktop App versions <6.0.0 fail to sanitize sensitive information from Mattermost logs and clear data on ser

6.5
CVE-2025-12689

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for p

3.1
CVE-2025-62690

Mattermost versions 10.11.x <= 10.11.4 fail to validate redirect URLs on the /error page, which allows an attacker to re

4.3
CVE-2025-62190

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 and Mattermost Calls versions <=1.10.0 fail

3.0
CVE-2025-13352

Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identit

3.1
CVE-2025-13870

Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files

4.3
CVE-2025-12756

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user pe

9.9
CVE-2025-12421

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that t

4.3
CVE-2025-12559

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to sanitize team em

Frequently Asked Questions

How many CVEs affect Mattermost?

Mattermost has 626 CVE records in our database, including 21 critical and 90 high severity vulnerabilities.

What are the most severe Mattermost vulnerabilities?

Mattermost has 21 critical severity (CVSS 9.0+) and 90 high severity (CVSS 7.0-8.9) vulnerabilities. Review the list above sorted by publication date to find the most recent high-severity issues.

How can I scan for Mattermost vulnerabilities?

CyberStrike's AI-powered security agents automatically detect vulnerabilities in Mattermost products across your infrastructure. The platform provides continuous pentesting, DAST scanning, and real-time vulnerability monitoring with actionable remediation guidance.

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