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Vulnerability Details :

CVE-2026-2299

Summary
Assigner-Mattermost
Assigner Org ID-9302f53e-dde5-4bf3-b2f2-a83f91ac0eee
Published At-25 Jun, 2026 | 18:55
Updated At-26 Jun, 2026 | 14:05
Rejected At-
Credits

Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Mattermost
Assigner Org ID:9302f53e-dde5-4bf3-b2f2-a83f91ac0eee
Published At:25 Jun, 2026 | 18:55
Updated At:26 Jun, 2026 | 14:05
Rejected At:
▼CVE Numbering Authority (CNA)
Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership.

Affected Products
Vendor
Mattermost, Inc.Mattermost
Product
Mattermost Google Drive Plugin
Repo
https://github.com/mattermost/mattermost-plugin-google-drive
Default Status
unaffected
Versions
Affected
  • From 0 through 1.0.0 (semver)
Unaffected
  • 1.1.0
Problem Types
TypeCWE IDDescription
CWECWE-862CWE-862: Missing Authorization
Type: CWE
CWE ID: CWE-862
Description: CWE-862: Missing Authorization
Metrics
VersionBase scoreBase severityVector
3.14.2MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Version: 3.1
Base score: 4.2
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Update Mattermost Google Drive plugin to version 1.1.0 or higher.

Configurations

Workarounds

Exploits

Credits

finder
Lorenzo Gallegos
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0
N/A
Hyperlink: https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:responsibledisclosure@mattermost.com
Published At:25 Jun, 2026 | 20:17
Updated At:26 Jun, 2026 | 14:17

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.2MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
N/A
Type: Secondary
Version: 3.1
Base score: 4.2
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-862Secondaryresponsibledisclosure@mattermost.com
CWE ID: CWE-862
Type: Secondary
Source: responsibledisclosure@mattermost.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0responsibledisclosure@mattermost.com
N/A
Hyperlink: https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0
Source: responsibledisclosure@mattermost.com
Resource: N/A

Change History

0
Information is not available yet

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