Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint
Priority LOW 19CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-862.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00201 10th percentileScored 2026-11-07
Fix Fixed Mattermost Google Drive Plugin (Mattermost): 1.1.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost Google Drive Plugin | up to 1.0.0 | 1.1.0 | Patch available | CNA |
- Mattermost Google Drive Plugin VendorMattermost Affected up to 1.0.0 Fixed in 1.1.0 Patch available CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:google_drive:*:*:*:*:*:mattermost:*:* | before 1.1.0 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:google_drive:1.1.0:rc1:*:*:*:mattermost:*:* | 1.1.0 rc1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:google_drive:1.1.0:rc2:*:*:*:mattermost:*:* | 1.1.0 rc2 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:google_drive:*:*:*:*:*:mattermost:*:* Versions before 1.1.0 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:google_drive:1.1.0:rc1:*:*:*:mattermost:*:* Versions 1.1.0 rc1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:google_drive:1.1.0:rc2:*:*:*:mattermost:*:* Versions 1.1.0 rc2 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost Google Drive Plugin (Mattermost) Fixed in 1.1.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-2299
- 2026-10-03 Alias added: GHSA-m2c6-qhf9-2xm8
Sources
- CVE-2026-2299 · CVE Program
- CVE-2026-2299 · NVD
- FIRST EPSS
- GHSA-m2c6-qhf9-2xm8 · GitHub Advisory Database · CC BY 4.0
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