Mattermost up to 9.11.17/10.5.8 API Endpoint schemeRoles authorization

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.2$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Mattermost up to 9.11.17/10.5.8. The affected element is an unknown function of the file /api/v4/teams/team-id/members/user-id/schemeRoles of the component API Endpoint. Executing a manipulation can lead to authorization. This vulnerability is registered as CVE-2025-53971. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Mattermost up to 9.11.17/10.5.8. It has been declared as problematic. This vulnerability affects an unknown code block of the file /api/v4/teams/team-id/members/user-id/schemeRoles of the component API Endpoint. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.

The weakness was published by hackit_bharat. The advisory is shared for download at mattermost.com. This vulnerability was named CVE-2025-53971 since 07/22/2025. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation requires an enhanced level of successful authentication. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 264624 (Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.10.0 Incorrect Authorization (MMSA-2025-00485)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.11.18, 10.5.9 or 10.10.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (264624), EUVD (EUVD-2025-25413) and CERT Bund (WID-SEC-2025-1625). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Mattermost Mattermost

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.8
CNA Vector (Mattermost): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 264624
Nessus Name: Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.10.0 Incorrect Authorization (MMSA-2025-00485)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 9.11.18/10.5.9/10.10.0

Timelineinfo

07/22/2025 CVE reserved
08/21/2025 +30 days Advisory disclosed
08/21/2025 +0 days VulDB entry created
09/13/2025 +23 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Researcher: hackit_bharat
Status: Confirmed

CVE: CVE-2025-53971 (🔒)
GCVE (CVE): GCVE-0-2025-53971
GCVE (VulDB): GCVE-100-320920
EUVD: 🔒
CERT Bund: WID-SEC-2025-1625 - Mattermost Server und Plugins: Mehrere Schwachstellen

Entryinfo

Created: 08/21/2025 11:41
Updated: 09/13/2025 11:39
Changes: 08/21/2025 11:41 (65), 08/21/2025 13:14 (7), 08/21/2025 14:29 (1), 08/21/2025 15:42 (1), 09/13/2025 11:39 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!