Session is not invalidated on server-side when user logged out of Boards
Priority LOW 34CWE-613Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-613.
Summary
Mattermost Boards plugin v0.10.0 and earlier fails to invalidate a session on the server-side when a user logged out of Boards, which allows an attacker to reuse old session token for authorization.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00723 54th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Mattermost Boards (Mattermost): 0.9.5, 0.8.4, 0.7.5
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 Boards | up to 0.10.0 | 0.9.5, 0.8.4, 0.7.5 | Patch available | CNA |
- Mattermost Boards VendorMattermost Affected up to 0.10.0 Fixed in 0.9.5, 0.8.4, 0.7.5 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_boards:*:*:*:*:*:*:*:* | up to 0.10.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_boards:*:*:*:*:*:*:*:* Versions up to 0.10.0 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost Boards (Mattermost) Fixed in 0.9.5, 0.8.4, 0.7.5
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Mattermost Boards unspecified
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2021-15668 Emails of all users are exposed via one of the Boards APIsPriority LOW 21
Timeline
- 2026-10-02 Threatist record created from CVE-2021-37866
- 2026-10-03 Alias added: GHSA-g28x-633f-r8qf
References
More Mattermost Boards vulnerabilities
- TI-2021-15668 Emails of all users are exposed via one of the Boards APIs CVSS 3.1MEDIUM 4.3
Sources
- CVE-2021-37866 · CVE Program
- CVE-2021-37866 · NVD
- FIRST EPSS
- GHSA-g28x-633f-r8qf · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences