CVE-2021-37866 json
Session is not invalidated on server-side when user logged out of Boards
published 2022-01-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24344
- cvss
- 4.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 54%
- public exploits
- 0
- none known
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 23 mo ago
Exploit prediction
0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- whitesourcesoftware.com https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-37866 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.7 | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- Mattermost Mattermost Boards
Classification
- Weakness
-
- CWE-613 DEPRECATED: Insufficient Session Expiration
References
-
whitesourcesoftware.com
/vulnerability-database/CVE-2021-37866
exploit, third-party-advisory
-
mattermost.com
/security-updates/
vendor-advisory
Sources
- CVE List CVE-2021-37866
- NVD CVE-2021-37866
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.