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Fencer Vulns
medium 6.1

CVE-2019-25027 json

Reflected cross-site scripting in default RouteNotFoundError view in Vaadin 10 and 11-13

published 2021-04-19 5 y ago modified 2026-06-17 4 mo ago also GHSA-rp4x-wxqv-cf9m , EUVD-2021-0873

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

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

Patch / fix

  • maven com.vaadin:flow-server 1.0.11, 1.4.3
  • vaadin flow 1.0.11, 1.4.3
  • vaadin vaadin 10.0.14, 13.0.6

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

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:flow-server
>=1.0.0, <1.0.11
>=1.1.0, <1.4.3
1.0.11
1.4.3

Affected products

  • Vaadin Vaadin
  • Vaadin flow-server

Classification

Weakness
  • CWE-81 Improper Neutralization of Script in an Error Message Web Page
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.