CVE-2021-33611 Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14

What is CVE-2021-33611?

CVE-2021-33611 is a medium-severity cross-site scripting vulnerability in Vaadin, published on 2 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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

Weakness: CWE-79

Which versions are affected by CVE-2021-33611?

4 open source packages ship an affected version, including com.vaadin:vaadin-bom and org.webjars.bowergithub.vaadin:vaadin-menu-bar. It affects 2 products.

Products include Vaadin Vaadin, Vaadin Vaadin-Menu-Bar.

How do I fix CVE-2021-33611?

Upgrade com.vaadin:vaadin-bom to 14.4.5 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-33611 being exploited?

There is no known exploitation of CVE-2021-33611 in the wild and no public exploit code.

Other vulnerabilities in Vaadin

• CVE-2021-31409 Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19 High 7.5
• CVE-2020-36320 Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7 High 7.5
• CVE-2023-25499 Possible information disclosure in non visible components Medium 5.7
• CVE-2022-29567 Possible information disclosure inside TreeGrid component with default data provider Medium 5.7
• CVE-2019-25028 Stored cross-site scripting in Grid component in Vaadin 7 and 8 Medium 5.4

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-93c4-vf86-3rj7.