CVE-2021-33611

Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14

6.1 MediumFix available

Missing output sanitization in test sources in org.webjars.bowergithub.vaadin:vaadin-menu-bar versions 1.0.0 through 1.2.0 (Vaadin 14.0.0 through 14.4.4) allows remote attackers to execute malicious JavaScript in browser by opening crafted URL

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.99%Up 0.2 points since Nov 3, 2021

What each source reports

CVE List Score used 6.1

Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14

Record: CVE-2021-33611
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2021-2327 6.1

Record: EUVD-2021-2327
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-93c4-vf86-3rj7 6.1

Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14

Missing output sanitization in test sources in org.webjars.bowergithub.vaadin:vaadin-menu-bar versions 1.0.0 through 1.2.0 (Vaadin 14.0.0 through 14.4.4) allows remote attackers to execute malicious JavaScript in browser by opening crafted URL.

Record: GHSA-93c4-vf86-3rj7
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 6.1

Record: CVE-2021-33611
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 6.1

Record: CVE-2021-33611
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVGHSA-93c4-vf86-3rj7 6.1

Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14

Record: GHSA-93c4-vf86-3rj7
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`com.vaadin:vaadin-bom` Maven	14.0.0 to 14.4.4	14.4.5
`org.webjars.bowergithub.vaadin:vaadin-menu-bar` Maven	1.0.0 to 1.2.0	1.2.1
`com.vaadin:vaadin-bom` Maven	14.0.0 up to 14.4.5, plus listed versions 14.0.114.0.1014.0.1114.0.1214.0.13 Show 45 moreShow less 14.0.1414.0.1514.0.214.0.314.0.414.0.514.0.614.0.714.0.814.0.914.1.014.1.114.1.1614.1.1714.1.1814.1.1914.1.214.1.2014.1.2114.1.2214.1.2314.1.2414.1.2514.1.2614.1.2714.1.2814.1.314.1.414.1.514.2.014.2.114.2.214.2.314.3.014.3.114.3.214.3.314.3.414.3.514.3.614.3.714.3.814.3.914.4.014.4.1	14.4.5
`org.webjars.bowergithub.vaadin:vaadin-menu-bar` Maven	1.0.0 up to 1.2.1, plus listed versions 1.0.11.0.21.0.31.0.41.0.5 Show 6 moreShow less 1.1.01.1.0-alpha11.1.0-alpha21.2.01.2.0-alpha11.2.0-beta1	1.2.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-33611 is a medium vulnerability (CVSS 6.1) in Vaadin, published November 2, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.99%, the 62nd percentile. Fixed in com.vaadin:vaadin-bom 14.4.5.

References

This page doesn't list everything

Left out here: 3 versions. The JSON record has them.