Vulnerabilities in pkg:maven/com.vaadin/flow-client

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Advisory Summary

GHSA-6hgr-2g6q-3rmc is a MODERATE (CVSS 6.3) server session is not invalidated vulnerability (CWE-287: Improper Authentication) affecting Flow client libraries in the Maven ecosystem. The issue involves server session is not invalidated when logout() helper method of authentication module is used in vaadin 18-19. Remediation is available by upgrading affected packages to version 6.0.5.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:maven/com.vaadin/flow-client

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:maven/com.vaadin/flow-client. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-6hgr-2g6q-3rmc - MODERATE Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19

GHSA-6hgr-2g6q-3rmc at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-6hgr-2g6q-3rmc
Severity MODERATE
CVSS v3.1 Base Score 6.3
CWE Classification CWE-287: Improper Authentication
Affected Product Flow client
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N).

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix GHSA-6hgr-2g6q-3rmc

To remediate this vulnerability, upgrade all affected Flow client dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

com.vaadin:flow-client fixed: 6.0.5 
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>flow-client</artifactId>
    <version>6.0.5</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=com.vaadin

How to Check if You Are Affected

To determine whether your Java application is affected by GHSA-6hgr-2g6q-3rmc, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=com.vaadin

Analyze the terminal output to locate any version of Flow client in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.0.5), your application is affected.

Note: The mvn dependency:tree -Dincludes=com.vaadin command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Flow client, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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

GHSA-6hgr-2g6q-3rmc Affected Flow client Versions

1 component(s)
Fixed Versions:
6.0.5
Product / Package Ecosystem Affected Versions Fixed Version
com.vaadin:flow-client
maven/com.vaadin/flow-client
Maven
≥ 5.0.0
< 6.0.5
6.0.5

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vaadin/flow/security/advisories/GHSA-6hgr-2g6q-3rmc
Flow client Source Repository REPOSITORY
https://github.com/vaadin/flow/pull/10577
Security Fix Commit FIX COMMIT
https://github.com/vaadin/flow/commit/815b967fc84fefa8d3a4d72b9a036f48b0d96326
Flow client Source Repository REPOSITORY
https://github.com/vaadin/flow
Flow client Security Information SECURITY
https://vaadin.com/security/cve-2021-31408

Frequently Asked Questions

What is GHSA-6hgr-2g6q-3rmc?
GHSA-6hgr-2g6q-3rmc is a security vulnerability in Flow client involving Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19 under CWE-287: Improper Authentication.
Which Flow client versions are affected?
Affected versions include releases prior to 6.0.5 across affected packages: com.vaadin:flow-client.
What version fixes GHSA-6hgr-2g6q-3rmc?
Upgrading to 6.0.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is flow-client affected?
Yes, com.vaadin:flow-client is affected in releases prior to 6.0.5. Upgrade your dependency to 6.0.5 or later.
What is the CVSS score of GHSA-6hgr-2g6q-3rmc?
GHSA-6hgr-2g6q-3rmc has a CVSS v3.1 base score of 6.3 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.
What CWE is associated with GHSA-6hgr-2g6q-3rmc?
GHSA-6hgr-2g6q-3rmc is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check Maven dependencies for GHSA-6hgr-2g6q-3rmc?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.vaadin'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6hgr-2g6q-3rmc",
  "modified" : "2021-10-08T21:22:21Z",
  "published" : "2021-04-22T16:11:26Z",
  "aliases" : [ ],
  "summary" : "Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19",
  "details" : "`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.\n\n- https://vaadin.com/security/cve-2021-31408",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.vaadin:flow-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "6.0.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vaadin/flow/security/advisories/GHSA-6hgr-2g6q-3rmc"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vaadin/flow/pull/10577"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vaadin/flow/commit/815b967fc84fefa8d3a4d72b9a036f48b0d96326"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vaadin/flow"
  }, {
    "type" : "WEB",
    "url" : "https://vaadin.com/security/cve-2021-31408"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-22T14:31:17Z",
    "nvd_published_at" : null
  }
}