Directory traversal in development mode handler in Vaadin 14 and 15-17
Improper URL validation in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.4.1 (Vaadin 14.0.0 through 14.4.2), and 3.0 prior to 5.0 (Vaadin 15 prior to 18) allows attacker to request arbitrary files stored outside of intended frontend resources folder.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | com.vaadin:flow-server | >= 3.0.0, < 5.0.0, >= 2.0.0, < 2.4.2 | 5.0.0, 2.4.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-20, CWE-22- Platform
- Java / Kotlin (Maven)
- Package
com.vaadin:flow-server- Disclosed
- 19.04.2021
- Updated
- 11.10.2026 11:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-49r2-73m6-pp8f - 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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