CVE-2021-37866: mattermost mattermost_boards Insufficient Session Expiration
CVSS: 7.5v3.1HighModified
Published 18-01-2022Last modified 06-12-2024
Vulnerability summary
CVE-2021-37866 is a high (CVSS 7.5) Insufficient Session Expiration vulnerability in mattermost mattermost_boards. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.72%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 0 · Duplicates 1Timeline
- 18-01-2022PublishedVulnerability first disclosed.
- 06-12-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSources2 sources · 4.7–7.5
- CVE.orgCNA4.7MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:NDiffers
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
0.72%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
0.00 pp
From 0.72% on 20-09-2026
20-09-202620-10-2026
EPSS score0.72%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (whitesourcesoftware.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Mattermost1 product
- mattermost_boards≥ unspecified, ≤ 0.10.0 | ≤ 0.10.0
1 vendor · 1 product
References
2 links- www.whitesourcesoftware.com/vulnerability-database/CVE-2021-37866X Refsource MISCExploitThird Party Advisory