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Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues

Moderate severity GitHub Reviewed Published Dec 24, 2025 to the GitHub Advisory Database • Updated Dec 26, 2025

Package

Codestin Search App github.com/mattermost/mattermost-server (Go)

Affected versions

>= 10.11.0, < 10.11.8
>= 10.12.0, < 10.12.4
>= 11.0.0, < 11.0.6
>= 11.1.0, < 11.1.1

Patched versions

10.11.8
10.12.4
11.0.6
11.1.1
Codestin Search App github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20251121122154-b57c297c6d7
8.0.0-20251121122154-b57c297c6d7

Description

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to.

References

Published by the National Vulnerability Database Dec 24, 2025
Published to the GitHub Advisory Database Dec 24, 2025
Reviewed Dec 26, 2025
Last updated Dec 26, 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
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:L/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.
(6th percentile)

Weaknesses

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. Learn more on MITRE.

CVE ID

CVE-2025-13767

GHSA ID

GHSA-fmqf-pmcm-8cx9

Source code

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