CVE-2021-31408

Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19

HIGH

7.1

CVSS Score

Published: April 23, 2021 at 04:07 PM UTC

Updated: June 17, 2026 at 03:51 AM UTC

2 products affected across 1 vendorVaadinFlow

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Severity

HIGH7.1

Exploit prediction

EPSS 0.3%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Flow · Vaadinmaven

95%

v ≥ 5.0.05.0.0 ≤ v < 6.0.06.0.0 ≤ v < 6.0.55.0.0

Affected range stops below 6.0.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.0.5, so it looks safe — our inference, not a vendor statement

Vaadin · Vaadinmaven

95%

v ≥ 18.0.019.0.0 ≤ v < 19.0.418.0.0

Affected range stops below 19.0.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

https://github.com/vaadin/flow/pull/10577

x_refsource_MISCVendor Advisory

Source: [email protected]

https://vaadin.com/security/cve-2021-31408

CVSS

7.1HIGH[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-613

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