Mattermost up to 8.1.6 Websocket information disclosure

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 (≈)
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CTI Interest Score
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A vulnerability classified as problematic was found in Mattermost up to 8.1.6. This vulnerability affects an unknown function of the component Websocket Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.

The weakness was presented 01/02/2024 by Daniel Espino Garcia. The advisory is shared for download at This vulnerability was named CVE-2023-48732 since 12/21/2023. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 8.1.7 eliminates this vulnerability.

See VDB-266314, VDB-266315, VDB-266316 and VDB-266317 for similar entries.





CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔒
VulDB CVSS-BT Score: 🔒
VulDB Vector: 🔒
VulDB Reliability: 🔍


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, Inc.): 🔒



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


Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒


Threat Intelligenceinfo

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


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 8.1.7


12/21/2023 CVE reserved
01/02/2024 +12 days Advisory disclosed
01/02/2024 +0 days VulDB entry created
01/02/2024 +0 days VulDB entry last update


Researcher: Daniel Espino Garcia
Status: Confirmed

CVE: CVE-2023-48732 (🔒)
See also: 🔒


Created: 01/02/2024 11:29 AM
Changes: 01/02/2024 11:29 AM (50)
Complete: 🔍
Cache ID: 44:69D:40


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