Reflected cross-site scripting in development mode handler in Vaadin
URL encoding error in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.6.1 (Vaadin 14.0.0 through 14.6.1), 3.0.0 through 6.0.9 (Vaadin 15.0.0 through 19.0.8) allows local user to execute arbitrary JavaScript code by opening crafted URL in browser.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | com.vaadin:flow-server | >= 2.0.0, < 2.6.2, >= 3.0.0, < 6.0.10 | 2.6.2, 6.0.10 |
References
- CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-172- Platform
- Java / Kotlin (Maven)
- Package
com.vaadin:flow-server- Disclosed
- 28.06.2021
- Updated
- 11.10.2026 12:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8vfw-v2jv-9hwc - CC BY 4.0
Vulnerability history: com.vaadin:flow-server
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 13
- First → latest
- 04.2021 03.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 8
- Low 4
Disclosures per year
- 2021: 10
- 2022: 0
- 2023: 2
- 2024: 0
- 2025: 0
- 2026: 1
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Reflected cross-site scripting in development mode handler in Vaadin this entry
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