Mattermost up to 9.11.16/10.5.7/10.8.x REST API insufficiently protected credentials

CVSS Meta Temp Score
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CTI Interest Score
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2.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Mattermost up to 9.11.16/10.5.7/10.8.x and classified as problematic. This vulnerability affects unknown code of the component REST API. Such manipulation leads to insufficiently protected credentials. This vulnerability is referenced as CVE-2025-6227. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mattermost up to 9.11.16/10.5.7/10.8.x. It has been rated as problematic. Affected by this issue is an unknown code of the component REST API. The manipulation with an unknown input leads to a insufficiently protected credentials vulnerability. Using CWE to declare the problem leads to CWE-522. The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval. Impacted is integrity. CVE summarizes:

Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.

The weakness was published by Miguel De La Cruz. The advisory is shared for download at mattermost.com. This vulnerability is handled as CVE-2025-6227 since 06/18/2025. The exploitation is known to be difficult. The attack may be launched remotely. The exploitation requires an enhanced level of successful authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1552.

The vulnerability scanner Nessus provides a plugin with the ID 242671 (Mattermost Server 9.11.x < 9.11.17 / 10.5.x < 10.5.8 (MMSA-2025-00474)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.11.17, 10.5.8 or 10.9.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (242671) and EUVD (EUVD-2025-21876). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.5
VulDB Meta Temp Score: 2.5

VulDB Base Score: 2.2
VulDB Temp Score: 2.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 3.1
NVD Vector: 🔒

CNA Base Score: 2.2
CNA Vector (Mattermost): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Insufficiently protected credentials
CWE: CWE-522
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 242671
Nessus Name: Mattermost Server 9.11.x < 9.11.17 / 10.5.x < 10.5.8 (MMSA-2025-00474)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 9.11.17/10.5.8/10.9.0

Timelineinfo

06/18/2025 CVE reserved
07/18/2025 +30 days Advisory disclosed
07/18/2025 +0 days VulDB entry created
10/14/2025 +88 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Researcher: Miguel De La Cruz
Status: Confirmed

CVE: CVE-2025-6227 (🔒)
GCVE (CVE): GCVE-0-2025-6227
GCVE (VulDB): GCVE-100-316880
EUVD: 🔒

Entryinfo

Created: 07/18/2025 14:08
Updated: 10/14/2025 16:38
Changes: 07/18/2025 14:08 (64), 07/18/2025 15:13 (1), 07/23/2025 02:19 (1), 07/25/2025 00:43 (2), 10/14/2025 16:38 (11)
Complete: 🔍
Cache ID: 216::103

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

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