Mattermost up to 9.11.11/10.5.2/10.6.x API authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Mattermost up to 9.11.11/10.5.2/10.6.x. This vulnerability affects unknown code of the component API. Such manipulation leads to authorization. This vulnerability is uniquely identified as CVE-2025-2527. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Mattermost up to 9.11.11/10.5.2/10.6.x and classified as problematic. Affected by this issue is an unknown function of the component API. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. CVE summarizes:

Mattermost versions 10.5.x <= 10.5.2, 9.11.x <= 9.11.11 failed to properly verify a user's permissions when accessing groups, which allows an attacker to view group information via an API request.

The weakness was disclosed by Ben Cooke. The advisory is shared for download at mattermost.com. This vulnerability is handled as CVE-2025-2527 since 03/19/2025. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 237101 (Mattermost Server 9.11.x < 9.11.12 / 10.5.x < 10.5.3 Multiple Vulnerabilities (MMSA-2025-00455, MMSA-2025-00456)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.11.12, 10.5.3 or 10.7.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (237101) and EUVD (EUVD-2025-15177). Once again VulDB remains the best source for vulnerability data.

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: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 4.3
CNA Vector (Mattermost): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔍

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Nessus ID: 237101
Nessus Name: Mattermost Server 9.11.x < 9.11.12 / 10.5.x < 10.5.3 Multiple Vulnerabilities (MMSA-2025-00455, MMSA-2025-00456)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Mattermost 9.11.12/10.5.3/10.7.0

Timelineinfo

03/19/2025 🔍
05/15/2025 +56 days 🔍
05/15/2025 +0 days 🔍
08/23/2025 +100 days 🔍

Sourcesinfo

Advisory: mattermost.com
Researcher: Ben Cooke
Status: Confirmed

CVE: CVE-2025-2527 (🔍)
GCVE (CVE): GCVE-0-2025-2527
GCVE (VulDB): GCVE-100-309092
EUVD: 🔍

Entryinfo

Created: 05/15/2025 18:04
Updated: 08/23/2025 04:06
Changes: 05/15/2025 18:04 (64), 05/17/2025 17:37 (1), 05/23/2025 06:38 (2), 08/23/2025 04:06 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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