What’s Vulnerable › Vulnerabilities

CVE-2019-25027: Reflected cross-site scripting in default RouteNotFoundError view in Vaadin 10 and 11-13

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-23 · updated 2026-06-17
• Weakness: CWE-81

Description

Missing output sanitization in default RouteNotFoundError view in com.vaadin:flow-server versions 1.0.0 through 1.0.10 (Vaadin 10.0.0 through 10.0.13), and 1.1.0 through 1.4.2 (Vaadin 11.0.0 through 13.0.5) allows attacker to execute malicious JavaScript via crafted URL

Affected products

• vaadin flow: from 1.0.0 before 1.0.11; from 1.1.0 before 1.4.3 — fixed in 1.0.11, 1.4.3
• Vaadin: from 10.0.0 before 10.0.14; from 11.0.0 before 13.0.6 — fixed in 10.0.14, 13.0.6

How to fix

Upgrade to a fixed version: vaadin flow 1.0.11, 1.4.3; Vaadin 10.0.14, 13.0.6. Check the vendor advisory for mitigations.

References

• https://github.com/vaadin/flow/pull/5498
• https://vaadin.com/security/cve-2019-25027
• https://github.com/vaadin/flow/pull/5498
• https://vaadin.com/security/cve-2019-25027

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