CVE-2021-31408
Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19
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.
- Record
CVE-2021-31408- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-613
- Updated
- 2026-11-02
EUVDEUVD-2021-0848
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.
- Record
EUVD-2021-0848- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-mr8h-j9cv-4m8h
Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19
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.
- Record
GHSA-mr8h-j9cv-4m8h- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-287, CWE-613
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-31408- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N - CVSS 2.0
- 3.3 Low
AV:L/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-613
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-31408- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-mr8h-j9cv-4m8h
Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19
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.
- Record
GHSA-mr8h-j9cv-4m8h- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - Weakness
- CWE-287, CWE-613
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
com.vaadin:vaadin-bomMaven |
18.0.0 up to 19.0.4 | 19.0.4 |
com.vaadin:vaadin-bomMaven |
18.0.0 up to 19.0.4, plus listed versions 18.0.118.0.218.0.318.0.418.0.5 Show 6 moreShow less18.0.618.0.719.0.019.0.119.0.219.0.3 |
19.0.4 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-31408 is a medium vulnerability (CVSS 6.3) in Vaadin Flow, published April 22, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 25th percentile. Fixed in com.vaadin:vaadin-bom 19.0.4.