What is CVE-2026-40986?

CVE-2026-40986 is a medium-severity vulnerability in Spring Web Flow, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-06-11.

How severe is CVE-2026-40986?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Spring Web Flow

CVE-2026-40986

Spring Web Flow's JavaScript RemotingHandler renders the body of an error response as HTML even when the response is not "text/html", which can result in a scripting attack in the user's browser if the error response from the server contai…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (10.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N.

Affected products

Spring Web Flow — versions 4.0.0, 3.0.0, 2.5.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@vmware.com

Frequently asked questions

What is CVE-2026-40986?: CVE-2026-40986 is a medium-severity vulnerability in Spring Web Flow, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-06-11.
How severe is CVE-2026-40986?: Medium severity. CVSS v3 base score is 4.8 out of 10.