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CVE-2026-40985 Spring CVE debrief

A vulnerability in Spring Web Flow allows malicious Unified EL expressions to be used when configuring the WebFlowELExpressionParser. This issue affects Spring Web Flow versions 4.0.0, 3.0.0 through 3.0.1, and 2.5.0 through 2.5.1.

Vendor
Spring
Product
Spring Web Flow
CVSS
MEDIUM 6.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-11
Original CVE updated
2026-09-04
Advisory published
2026-06-11
Advisory updated
2026-09-04

Who should care

Users of affected Spring Web Flow versions should review and update their configurations to mitigate this vulnerability.

Technical summary

The vulnerability has a CVSS score of 6.4 and is classified as MEDIUM severity. It can be exploited with a CVSS vector of CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N.

Defensive priority

MEDIUM

Recommended defensive actions

  • Review and update Spring Web Flow configurations to prevent malicious Unified EL expressions.
  • Apply patches or updates for affected versions (4.0.0, 3.0.0-3.0.1, 2.5.0-2.5.1).
  • Consult the official CVE record [cve-org] and NVD details [nvd] for further information.

Evidence notes

Evidence suggests that the vendor is likely related to Spring, based on information from [source-item].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40985 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40985

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-40985 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40985

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.