CVE-2021-31408

lowpriority · track · 28EPSS 0.003 · 25 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.32% (25th) EPSS

CVSS 3.3 · low

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 3.3–7.1

v2.03.3lowAV:L/AC:M/Au:N/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 3.4 · impact 4.9

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 1.8 · impact 5.2

v3.16.3mediumCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.16.3mediumCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · security@vaadin.comexploitability 1 · impact 5.2

v3.16.3mediumCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · OSV

v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-613USprimaryCWE-287USCWE-613US

affected products (7)

Products and version ranges known to be affected.

Vaadin Vaadin18.0.0 → *enisa_euvdEU
Vaadin flow-client5.0.0 → *enisa_euvdEU
vaadin flow5.0.0 → 6.0.0nvdUScpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
vaadin flow6.0.0 → 6.0.5nvdUScpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
vaadin vaadin= 18.0.0nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
vaadin vaadin19.0.0 → 19.0.4nvdUScpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
Maven com.vaadin:vaadin-bom18.0.0 → 19.0.4osvUSpkg:maven/com.vaadin/vaadin-bom

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-mr8h-j9cv-4m8hServer session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-192021-04-22ghsa · osvUS
`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

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2021-04-23modified 2026-06-17

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+728 more

references (7)

External citations — patches, advisories, analysis.

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