CVE-2026-40986

Spring Web Flow JS RemotingHandler renders non-HTML Response as HTML

MEDIUM

4.8

CVSS Score

Published: June 11, 2026 at 05:03 AM UTC

Updated: September 4, 2026 at 06:26 PM UTC

2 products affected across 2 vendorsSpring Web FlowSpring Web Flow

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Severity

MEDIUM4.8

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Spring Web Flow · Broadcom

95%

v < 2.5.23.0.0 ≤ v < 3.0.1.14.0.0

Affected range stops below 2.5.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.0.1.1, so it looks safe — our inference, not a vendor statement

Spring Web Flow · Spring

60%

2.5.0 ≤ v < 2.5.23.0.0 ≤ v < 3.0.1.14.0.0 ≤ v < 4.0.0.12.5.0 3.0.0 4.0.0

Affected range stops below 2.5.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.0.1.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.0.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

Vendor Advisory

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMvmware

Attack Vector: NETWORK
Complexity: HIGH
Privileges: LOW
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-79

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