Spring Web Flow JS RemotingHandler renders non-HTML Response as HTML
CVE-2026-40986

4.8MEDIUM

Key Information:

Vendor

Spring

Status
Spring Web Flow
Vendor
CVE Published:
11 June 2026

What is 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 contains error details with input reflected from an attacker.

Affected versions: Spring Web Flow 4.0.0; 3.0.0 through 3.0.1; 2.5.0 through 2.5.1.

Affected Version(s)

Spring Web Flow 4.0.0 < 4.0.1

Spring Web Flow 3.0.0 < 3.0.2

Spring Web Flow 2.5.0 < 2.5.2

References

https://spring.io/security/cve-2026-40986

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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