How severe is CVE-2026-40986?

CVE-2026-40986 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-40986 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40986?

CVE-2026-40986 primarily affects Broadcom Spring Web Flow. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-40986?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40986 have an EU (EUVD) identifier?

Yes. CVE-2026-40986 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36201.

When was CVE-2026-40986 published?

CVE-2026-40986 was published on 2026-06-11 and last updated on 2026-09-04.

CVE-2026-40986

CVE-2026-40986 is a medium-severity vulnerability in Broadcom Spring Web Flow with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36201
Weakness: CWE-79
Affected product: Broadcom Spring Web Flow
Published: 2026-06-11
Last modified: 2026-09-04

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.

Frequently asked questions

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.
How severe is CVE-2026-40986?: CVE-2026-40986 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-40986 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40986?: CVE-2026-40986 primarily affects Broadcom Spring Web Flow. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-40986?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40986 have an EU (EUVD) identifier?: Yes. CVE-2026-40986 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36201.
When was CVE-2026-40986 published?: CVE-2026-40986 was published on 2026-06-11 and last updated on 2026-09-04.

References

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

Affected products (2)

cpe:2.3:a:broadcom:spring_web_flow:*:*:*:*:*:*:*:*
cpe:2.3:a:broadcom:spring_web_flow:4.0.0:*:*:*:*:*:*:*

More vulnerabilities in Broadcom Spring Web Flow

CVE-2026-40985 — Medium (CVSS 6.4): Applications that configure the WebFlowELExpressionParser are vulnerable to the use of malicious Unified EL…
CVE-2017-8039 — Medium (CVSS 5.9): An issue was discovered in Pivotal Spring Web Flow through 2.4.5. Applications that do not change the value of the…
CVE-2017-4971 — Medium (CVSS 5.9): An issue was discovered in Pivotal Spring Web Flow through 2.4.4. Applications that do not change the value of the…

All CVEs affecting Broadcom Spring Web Flow →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2026-106102 — Critical (CVSS 10.0): Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.22.0, the SSR-only…
CVE-2026-59167 — Critical (CVSS 10.0): SunEditor is a lightweight and powerful WYSIWYG editor in vanilla JavaScript with no dependencies. Prior to 2.47.11,…
CVE-2026-85061 — Critical (CVSS 10.0): MapLibre GL JS is an interactive vector tile map library for web browsers. Prior to 6.4.1, DOM.sanitize() in…
CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →