What is the CVSS score of CVE-2025-3227?

CVE-2025-3227 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-3227?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Mattermost CVE-2025-3227

Q: Which versions of Mattermost are affected by CVE-2025-3227?

CVE-2025-3227 presents moderate security risk, a incorrect authorization vulnerability rated CVSS 4.3. Attackers could gain access beyond their authorized level.. A patch is available.

EUVD-2025-18758 MEDIUM

Incorrect Authorization (CWE-863)

2025-06-20 responsibledisclosure@mattermost.com

GHSA-qwwm-c582-82rx

Authentication Bypass Debian Mattermost Mattermost Server Suse

4.3

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-863 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Authorization logic validation MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 4.3 (MEDIUM).

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.1% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 15, 2026

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly enforce channel member management permissions in playbook runs, allowing authenticated users without the 'Manage Channel Members' permission to add or remove users from public and private channels by manipulating playbook run participants when the run is linked to a channel.

Earlier versions of this analysis (1)

v1 Mar 15, 2026 - 00:19 CVSS 4.3

RemediationAI

Monitor vendor advisories for patches. Apply mitigations such as network segmentation, access restrictions, and monitoring.

Affected VersionsENISA

Mattermost 9.11.0 ≤9.11.15

Mattermost 10.7.0 ≤10.7.2

Mattermost 10.8.0

Mattermost 10.5.0 ≤10.5.5

Mattermost 10.6.0 ≤10.6.5

Affected Packages

go github.com/mattermost/mattermost-server fix: 0.0.0-20250520060012-d0380305ef7a, 9.11.16+incompatible, 10.5.6+incompatible, 10.6.6+incompatible, 10.7.3+incompatible, 10.8.1+incompatible

go github.com/mattermost/mattermost-server/v5 no fix

go github.com/mattermost/mattermost-server/v6 no fix

go github.com/mattermost/mattermost/server/v8 fix: 8.0.0-20250520060012-d0380305ef7a, 9.11.16, 10.5.6, 10.6.6, 10.7.3, 10.8.1

euvd mattermost no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 5 packages in go, euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Incorrect Authorization (CWE-863).

Know when Mattermost gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 4.3 MEDIUM

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

SUSE MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Jun 20, 2025 - 15:15 nvd

MEDIUM 4.3

Executive ViewAI

Why It Matters

CVE-2025-3227 presents moderate security risk, a incorrect authorization vulnerability rated CVSS 4.3. Attackers could gain access beyond their authorized level. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low

Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score

0.1%

Top 83% exploitable

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS Vendor

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

Low

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +22

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Related Vulnerabilities in Mattermost Authorization and Validation Flaws

View all 3

CVE-2025-3228 MEDIUM

4.3

CVE-2025-4981 CRITICAL

9.9

More in Mattermost

View all

CVE-2025-25279 CRITICAL Act Now

9.9 Feb 24

Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate boa

CVE-2026-48801 HIGH This Week POC

8.7 Jun 26

Denial of service in linkify-it (npm) through v5.0.0 lets remote unauthenticated attackers wedge a rendering worker by s

CVE-2022-4044 MEDIUM This Month POC

6.5 Nov 23

A denial-of-service vulnerability in Mattermost allows an authenticated user to crash the server via multiple large auto

CVE-2022-3257 MEDIUM This Month POC

6.5 Sep 23

Mattermost version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded w

CVE-2025-20051 CRITICAL Act Now

9.9 Feb 24

Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate inp

CVE-2025-12421 CRITICAL Act Now

9.9 Nov 27

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

CVE-2025-12419 CRITICAL Act Now

9.9 Nov 27

Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validat

CVE-2026-4858 CRITICAL Act Now

9.9 May 21

Privilege escalation to full administrative control in Mattermost self-hosted server (versions 11.6.0 and earlier in the

CVE-2023-6458 CRITICAL Act Now

9.8 Dec 06

Mattermost webapp fails to validate route parameters in/<TEAM_NAME>/channels/<CHANNEL_NAME> allowing an attacker to perf

CVE-2020-26276 CRITICAL Act Now

9.8 Dec 17

Fleet is an open source osquery manager. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable,

CVE-2025-24490 CRITICAL Act Now

9.6 Feb 24

Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to use prepared statemen

Same weakness CWE-863 – Incorrect Authorization

View all

CVE-2025-54253 CRITICAL POC

10.0

CVE-2025-24200 MEDIUM

6.1

CVE-2026-71362 CRITICAL POC

9.1

CVE-2026-42016 HIGH POC

8.8

CVE-2023-21715 HIGH

7.3

CVE-2025-21480 HIGH

8.6

CVE-2025-21479 HIGH

8.6

CVE-2025-32462 HIGH POC

8.8

Same technique Authentication Bypass

View all

CVE-2015-3306 CRITICAL POC

10.0

CVE-2023-22515 CRITICAL POC

9.8

CVE-2012-4681 CRITICAL POC

9.8

CVE-2013-2465 CRITICAL POC

9.8

CVE-2011-3544 CRITICAL POC

9.8

CVE-2022-40684 CRITICAL POC

9.8

CVE-2025-61882 CRITICAL POC

9.8

CVE-2024-0012 CRITICAL POC

9.3

Vendor StatusVendor

Debian

Bug #823556

mattermost-server

Release	Status	Fixed Version	Urgency
	open	-	-

SUSE

Severity: Medium

Product	Status
SUSE Linux Enterprise Server 16.0	Fixed
openSUSE Tumbleweed	Fixed

References

Advisories & patches

ADVISORY https://github.com/mattermost/mattermost ADVISORY https://mattermost.com/security-updates ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-3227

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back