What is the CVSS score of CVE-2025-13821?

CVE-2025-13821 has a CVSS 3.1 base score of 5.7 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Mattermost Server are affected by CVE-2025-13821?

CVE-2025-13821 presents moderate security risk, a information exposure vulnerability rated CVSS 5.7. Sensitive information could be exposed to unauthorized parties.. A patch is available.

How to fix or mitigate CVE-2025-13821?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review data exposure and access controls.

Mattermost Server CVE-2025-13821

MEDIUM

Information Exposure (CWE-200)

2026-02-16 responsibledisclosure@mattermost.com

Information Disclosure Mattermost Server Suse

5.7

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.7 MEDIUM

AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

SUSE

MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Feb 16, 2026 - 12:16 nvd

MEDIUM 5.7

DescriptionCVE.org

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 messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560

AnalysisAI

Technical ContextAI

Classified as CWE-200 (Information Exposure). Affects Mattermost Server. 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 messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

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CVE-2017-16894 HIGH POC

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CVE-2016-1561 HIGH POC

7.5

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CVE-2017-5638 CRITICAL POC

9.8

CVE-2025-24813 CRITICAL POC

9.8

CVE-2015-1701 HIGH POC

7.8

CVE-2017-0147 HIGH POC

7.5

CVE-2014-6324 HIGH POC

8.8

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7.3

Vendor StatusVendor

SUSE

Severity: Medium

Product	Status
openSUSE Leap 15.6	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP5	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP6	Fixed
openSUSE Leap 15.5	Fixed

CVE-2025-13821 vulnerability details – vuln.today

Back

Mattermost Server CVE-2025-13821

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Mattermost Server

Same weakness CWE-200 – Information Exposure

Same technique Information Disclosure

Vendor StatusVendor

SUSE

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External POC / Exploit Code