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Mattermost vulnerable to information disclosure

Moderate severity GitHub Reviewed Published Mar 31, 2023 to the GitHub Advisory Database • Updated Jul 25, 2025

Package

gomod github.com/mattermost/mattermost-server (Go)

Affected versions

= 7.8.0
>= 7.7.0, <= 7.7.1
>= 7.1.0, <= 7.1.5
>= 1.4.1-0.20211025164829-f7a8147b825c, < 1.4.1-0.20230301145909-10be118d99a5

Patched versions

7.8.1
7.7.2
7.1.6
1.4.1-0.20230301145909-10be118d99a5
gomod github.com/mattermost/mattermost-server/v6 (Go)
>= 6.3.0, <= 6.7.2
>= 6.0.0-20211025164829-f7a8147b825c, < 6.0.0-20230301145909-10be118d99a5
7.1.6
6.0.0-20230301145909-10be118d99a5

Description

Mattermost allows an attacker to request a preview of an existing message when creating a new message via the createPost API call, disclosing the contents of the linked message.

References

Published by the National Vulnerability Database Mar 31, 2023
Published to the GitHub Advisory Database Mar 31, 2023
Reviewed Apr 7, 2023
Last updated Jul 25, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(40th percentile)

Weaknesses

Exposure of Resource to Wrong Sphere

The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource. Learn more on MITRE.

CVE ID

CVE-2023-1777

GHSA ID

GHSA-3wq5-3f56-v5xc

Source code

github.com/mattermost/mattermost-server
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