CVE-2021-33611 json
Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 14
published 2021-11-02 5 y ago modified 2026-06-17 4 mo ago also GHSA-93c4-vf86-3rj7 , EUVD-2021-2327
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- maven com.vaadin:vaadin-bom 14.4.5
- maven org.webjars.bowergithub.vaadin:vaadin-menu-bar 1.2.1
- github.com/vaadin/vaadin-menu-bar#126 pull request
Exploit prediction
0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- vaadin.com https://vaadin.com/security/cve-2021-33611 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | com.vaadin:vaadin-bom | >=14.0.0, <14.4.5 |
14.4.5 |
| maven | org.webjars.bowergithub.vaadin:vaadin-menu-bar | >=1.0.0, <1.2.1 |
1.2.1 |
Affected products
- Vaadin Vaadin
- Vaadin vaadin-menu-bar
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/vaadin/vaadin-menu-bar/pull/126
web, patch, third-party-advisory
-
vaadin.com
/security/cve-2021-33611
web, exploit, third-party-advisory
-
github.com
/vaadin/platform/security/advisories/GHSA-93c4-vf86-3rj7
web
-
nvd.nist.gov
/vuln/detail/CVE-2021-33611
advisory
-
github.com
/vaadin/platform
package
Sources
- CVE List CVE-2021-33611
- GitHub Advisory GHSA-93c4-vf86-3rj7
- NVD CVE-2021-33611
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