Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-2299
StatePUBLISHED
AssignerMattermost
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 20:17:10 UTC
Updated2026-06-26 14:17:03 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 4.2 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.001190000 probability, percentile 0.021050000 (date 2026-06-29)

Problem Types: CWE-862 | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
3.1CNACVSS4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mattermost Mattermost Google Drive Plugin affected 1.0.0 semver Not specified
CNA Mattermost Mattermost Google Drive Plugin unaffected 1.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Lorenzo Gallegos (en)

Additional Advisory Data

Solutions

CNA: Update Mattermost Google Drive plugin to version 1.1.0 or higher.

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