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CVE-2025-3446

Members Without Guest Invite Permissions Can Add Guests to Teams

4.3 MediumFix available

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to check the correct permissions which allows authenticated users who only have permission to invite non-guest users to a team to add guest users to that team via the API to add a single user to a team.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.26%Up 0.2 points since May 15, 2025
90%50%10%1%

What each source reports

CVE List Score used 4.3

Members Without Guest Invite Permissions Can Add Guests to Teams

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to check the correct permissions which allows authenticated users who only have permission to invite non-guest users to a team to add guest users to that team via the API to add a single user to a team.

Record
CVE-2025-3446
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2025-15149 4.3

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to check the correct permissions which allows authenticated users who only have permission to invite non-guest users to a team to add guest users to that team via the API to add a single user to a team.

Record
EUVD-2025-15149
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-r7r2-m3vr-c8qc 4.3

Mattermost Fails to Validate Team Invite Permissions

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to check the correct permissions which allows authenticated users who only have permission to invite non-guest users to a team to add guest users to that team via the API to add a single user to a team.

Record
GHSA-r7r2-m3vr-c8qc
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
NVD 4.3

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to check the correct permissions which allows authenticated users who only have permission to invite non-guest users to a team to add guest users to that team via the API to add a single user to a team.

Record
CVE-2025-3446
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSV 4.3

Members Without Guest Invite Permissions Can Add Guests to Teams

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to check the correct permissions which allows authenticated users who only have permission to invite non-guest users to a team to add guest users to that team via the API to add a single user to a team.

Record
CVE-2025-3446
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSVGHSA-r7r2-m3vr-c8qc 4.3

Mattermost Fails to Validate Team Invite Permissions

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to check the correct permissions which allows authenticated users who only have permission to invite non-guest users to a team to add guest users to that team via the API to add a single user to a team.

Record
GHSA-r7r2-m3vr-c8qc
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSVGO-2025-3693 No score

Mattermost Fails to Validate Team Invite Permissions in github.com/mattermost/mattermost-server

Mattermost Fails to Validate Team Invite Permissions in github.com/mattermost/mattermost-server

Record
GO-2025-3693
Updated
2026-11-02
OSVopenSUSE-SU-2025:15159-1 No score

govulncheck-vulndb-0.0.20250523T151856-1.1 on GA media

These are all security issues fixed in the govulncheck-vulndb-0.0.20250523T151856-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:15159-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/mattermost/mattermost/server/v8
Go
 10.6.0 to 10.6.1
10.6.2
github.com/mattermost/mattermost/server/v8
Go
 10.5.0 to 10.5.2
10.5.3
github.com/mattermost/mattermost/server/v8
Go
 10.4.0 to 10.4.4
10.4.5
github.com/mattermost/mattermost/server/v8
Go
 9.11.0 to 9.11.11
9.11.12
github.com/mattermost/mattermost/server/v8
Go
 before 8.0.0-20250415054241-76ab3867b785
8.0.0-20250415054241-76ab3867b785
github.com/mattermost/mattermost/server/v8
Go
 10.6.0 up to 10.6.2
10.6.2
github.com/mattermost/mattermost/server/v8
Go
 10.5.0 up to 10.5.3
10.5.3
github.com/mattermost/mattermost/server/v8
Go
 10.4.0 up to 10.4.5
10.4.5
github.com/mattermost/mattermost/server/v8
Go
 9.11.0 up to 9.11.12
9.11.12
github.com/mattermost/mattermost-server
Go
 9.11.0+incompatible up to 9.11.12+incompatible, 10.4.0+incompatible up to 10.4.5+incompatible, 10.5.0+incompatible up to 10.5.3+incompatible, 10.6.0+incompatible up to 10.6.2+incompatible
9.11.12+incompatible10.4.5+incompatible10.5.3+incompatible10.6.2+incompatible
github.com/mattermost/mattermost-server/v5
Go
 All versions None known
github.com/mattermost/mattermost-server/v6
Go
 All versions None known
govulncheck-vulndb
openSUSE:Tumbleweed
From an advisory covering 14 CVEs
 before 0.0.20250523T151856-1.1
0.0.20250523T151856-1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-3446 is a medium vulnerability (CVSS 4.3) in Mattermost, published May 15, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 17th percentile. Fixed in github.com/mattermost/mattermost/server/v8 10.6.2.

References

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