5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2025-27933

GHSA ID

GHSA-h5v9-xw2g-7hrq

EPSS Score

0.08858%

CWE

CWE-863

Published

3/21/2025

Updated

3/21/2025

KEV Status

Technology

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

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CVE-2025-27933

CVE-2025-27933: Mattermost allows members with permission to convert public channels to private and convert private to public

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-27933

CVE-2025-27933:

5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2025-27933

GHSA ID

GHSA-h5v9-xw2g-7hrq

EPSS Score

0.08858%

CWE

CWE-863

Published

3/21/2025

Updated

3/21/2025

KEV Status

Technology

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

Technical Details

CVSS Vector

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

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/mattermost/mattermost/server/v8	go
github.com/mattermost/mattermost/server/v8	go
github.com/mattermost/mattermost/server/v8	go
github.com/mattermost/mattermost-server	go
github.com/mattermost/mattermost/server/v8	go

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from improper authorization checks during channel type conversions. While exact code isn't available, Mattermost's architecture suggests:

API handlers (api4/channel.go) would handle conversion requests
Core channel logic (app/channel.go) would perform the actual conversion
The pattern of CWE-863 indicates missing/incorrect permission validation in these flows
The vulnerability description specifically mentions improper enforcement of conversion direction restrictions, implying the authorization check didn't differentiate between conversion directions

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.

Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.

5.4

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2025-27933: Mattermost allows members with permission to convert public channels to private and convert private to public

CVE-2025-27933:

5.4

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

Basic Information

Basic Information

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

5.4

5.4

CVE-2025-27933: Mattermost allows members with permission to convert public channels to private and convert private to public

Technical Details

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI