CVE-2021-31408

low-risk
Published 2021-04-23

Authentication.logout() helper in com.vaadin:flow-client versions 5.0.0 prior to 6.0.0 (Vaadin 18), and 6.0.0 through 6.0.4 (Vaadin 19.0.0 through 19.0.3) uses incorrect HTTP method, which, in combination with Spring Security CSRF protection, allows local attackers to access Fusion endpoints after the user attempted to log out.

Do I need to act?

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0.05% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.3/10 Medium
LOCAL / HIGH complexity

Affected Products (3)

Flow

Affected Vendors

Vaadin

References (4)

Patch https://github.com/vaadin/flow/pull/10577
Vendor Advisory https://vaadin.com/security/cve-2021-31408
Patch https://github.com/vaadin/flow/pull/10577
Vendor Advisory https://vaadin.com/security/cve-2021-31408
25
/ 100
low-risk
Severity 16/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 9/34 · Low