Mattermost up to 10.5.10/10.10.2/10.11.2 Slack Import authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Mattermost up to 10.5.10/10.10.2/10.11.2. It has been rated as critical. This issue affects some unknown processing of the component Slack Import Handler. This manipulation causes authorization. This vulnerability appears as CVE-2025-41410. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Mattermost up to 10.5.10/10.10.2/10.11.2 and classified as critical. Affected by this vulnerability is an unknown function of the component Slack Import Handler. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Mattermost versions 10.10.x <= 10.10.2, 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to validate email ownership during Slack import process which allows attackers to create verified user accounts with arbitrary email domains via malicious Slack import data to bypass email-based team access restrictions

The weakness was presented by daw10. It is possible to read the advisory at mattermost.com. This vulnerability is known as CVE-2025-41410 since 09/16/2025. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 271809 (Mattermost Server 10.5.x < 10.5.11 / 10.10.x < 10.10.3 / 10.11.x 10.11.3 / 10.12.0 Missing Authorization (MMSA-2025-00525)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 10.5.11, 10.10.3, 10.11.3 or 10.12.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (271809). Be aware that VulDB is the high quality 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: 5.9
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.4
CNA Vector (Mattermost): 🔒

CVSSv2info

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

Exploitinginfo

Class: Authorization
CWE: CWE-862 / CWE-863 / CWE-285
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: 271809
Nessus Name: Mattermost Server 10.5.x < 10.5.11 / 10.10.x < 10.10.3 / 10.11.x 10.11.3 / 10.12.0 Missing Authorization (MMSA-2025-00525)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 10.5.11/10.10.3/10.11.3/10.12.0

Timelineinfo

09/16/2025 CVE reserved
10/16/2025 +30 days Advisory disclosed
10/16/2025 +0 days VulDB entry created
10/28/2025 +12 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Researcher: daw10
Status: Confirmed

CVE: CVE-2025-41410 (🔒)
GCVE (CVE): GCVE-0-2025-41410
GCVE (VulDB): GCVE-100-328783

Entryinfo

Created: 10/16/2025 11:12
Updated: 10/28/2025 23:00
Changes: 10/16/2025 11:12 (64), 10/28/2025 23:00 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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