Mattermost up to 9.11.7/10.2.2/10.3.2/10.4.1 Block path traversal

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Mattermost up to 9.11.7/10.2.2/10.3.2/10.4.1. Impacted is an unknown function of the component Block Handler. Executing a manipulation can lead to path traversal. This vulnerability is registered as CVE-2025-20051. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Mattermost up to 9.11.7/10.2.2/10.3.2/10.4.1. It has been declared as critical. This vulnerability affects some unknown functionality of the component Block Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.

The weakness was published by visat. The advisory is shared for download at mattermost.com. This vulnerability was named CVE-2025-20051 since 02/18/2025. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

The vulnerability scanner Nessus provides a plugin with the ID 216937 (Mattermost Server 9.11.x < 9.11.8 / 10.2.x < 10.2.3 / 10.3.x < 10.3.3 / 10.4.x < 10.4.2 (MMSA-2025-00430)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.11.8, 10.2.3, 10.3.3, 10.4.2 or 10.5.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (216937). 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: 7.6
VulDB Meta Temp Score: 7.5

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

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 9.9
CNA Vector (Mattermost): 🔍

CVSSv2info

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

Exploitinginfo

Class: Path traversal
CWE: CWE-22
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: 216937
Nessus Name: Mattermost Server 9.11.x < 9.11.8 / 10.2.x < 10.2.3 / 10.3.x < 10.3.3 / 10.4.x < 10.4.2 (MMSA-2025-00430)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Mattermost 9.11.8/10.2.3/10.3.3/10.4.2/10.5.0

Timelineinfo

02/18/2025 🔍
02/24/2025 +6 days 🔍
02/24/2025 +0 days 🔍
08/18/2025 +175 days 🔍

Sourcesinfo

Advisory: mattermost.com
Researcher: visat
Status: Confirmed

CVE: CVE-2025-20051 (🔍)
GCVE (CVE): GCVE-0-2025-20051
GCVE (VulDB): GCVE-100-296620

Entryinfo

Created: 02/24/2025 09:54
Updated: 08/18/2025 20:42
Changes: 02/24/2025 09:54 (65), 02/28/2025 20:34 (2), 08/18/2025 20:42 (12)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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