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Mattermost Server Missing Authorization vulnerability

Moderate severity GitHub Reviewed Published Jun 16, 2023 to the GitHub Advisory Database • Updated Jul 25, 2025

Package

gomod github.com/mattermost/mattermost-server/v6 (Go)

Affected versions

= 7.10.0
>= 7.9.0, < 7.9.4
>= 6.0.0, < 7.8.5
< 6.0.0-20230511130429-1629a6ca7fed

Patched versions

7.10.1
7.9.4
7.8.5
6.0.0-20230511130429-1629a6ca7fed

Description

Mattermost Apps Framework fails to verify that a secret provided in the incoming webhook request allowing an attacker to modify the contents of the post sent by the Apps.

References

Published by the National Vulnerability Database Jun 16, 2023
Published to the GitHub Advisory Database Jun 16, 2023
Reviewed Jun 23, 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
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
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:L/UI:N/S:U/C:N/I:L/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.
(29th percentile)

Weaknesses

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Learn more on MITRE.

CVE ID

CVE-2023-2783

GHSA ID

GHSA-455c-vqrf-mghr

Source code

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