CVE-2026-2299

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.

CVSS v3 4.2 MEDIUM

4.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0	Product Release Notes

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mattermost:google_drive::::::mattermost::*
	cpe:2.3:a:mattermost:google_drive:1.1.0:rc1::::mattermost::*
	cpe:2.3:a:mattermost:google_drive:1.1.0:rc2::::mattermost::*

History

No history.

Information

Published : 2026-06-25 20:17

Updated : 2026-08-11 14:08

NVD link : CVE-2026-2299

Mitre link : CVE-2026-2299

CVE.ORG link : CVE-2026-2299

JSON object : View

Products Affected

mattermost

google_drive

CWE

CWE-862

Missing Authorization

{"id": "CVE-2026-2299", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-2299", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-26T14:04:57.007408Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "responsibledisclosure@mattermost.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.2, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 1.6}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "affected": [{"source": "responsibledisclosure@mattermost.com", "affectedData": [{"repo": "https://github.com/mattermost/mattermost-plugin-google-drive", "vendor": "Mattermost", "product": "Mattermost Google Drive Plugin", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "1.0.0"}, {"status": "unaffected", "version": "1.1.0"}], "defaultStatus": "unaffected"}]}], "published": "2026-06-25T20:17:10.763", "references": [{"url": "https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0", "tags": ["Product", "Release Notes"], "source": "responsibledisclosure@mattermost.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "responsibledisclosure@mattermost.com", "description": [{"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-08-11T14:08:46.577", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mattermost:google_drive:*:*:*:*:*:mattermost:*:*", "vulnerable": true, "matchCriteriaId": "47639DA2-A1C8-4380-A813-D3B96F3BEF50", "versionEndExcluding": "1.1.0"}, {"criteria": "cpe:2.3:a:mattermost:google_drive:1.1.0:rc1:*:*:*:mattermost:*:*", "vulnerable": true, "matchCriteriaId": "55D809C2-A5F6-47A1-B058-84C8E33F153E"}, {"criteria": "cpe:2.3:a:mattermost:google_drive:1.1.0:rc2:*:*:*:mattermost:*:*", "vulnerable": true, "matchCriteriaId": "96AD70C3-22A3-4A35-93BC-BA89287F8497"}], "operator": "OR"}]}], "sourceIdentifier": "responsibledisclosure@mattermost.com"}