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PatchSiren cyber security CVE debrief

CVE-2026-4503 Langflow CVE debrief

CVE-2026-4503 is a high-severity access-control flaw in IBM Langflow Desktop that can let an unauthenticated user view images belonging to other users. The issue is tied to an indirect object reference through a user-controlled key, which aligns with CWE-639 and an NVD CVSS 3.1 score of 7.5. Affected versions are 1.0.0 through 1.8.4.

Vendor
Langflow
Product
Langflow Desktop
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-30
Original CVE updated
2026-05-11
Advisory published
2026-04-30
Advisory updated
2026-05-11

Who should care

Administrators, security teams, and operators of IBM Langflow Desktop deployments should prioritize this issue, especially any environment where multiple users can store or access images.

Technical summary

NVD lists CVE-2026-4503 as affecting langflow_desktop versions 1.0.0 through 1.8.4. The weakness is described as an indirect object reference through a user-controlled key, allowing an unauthenticated user to view other users’ images. The NVD record maps the issue to CWE-639 and the vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, indicating network-reachable exposure with no privileges or user interaction required and high confidentiality impact.

Defensive priority

High. The lack of authentication and the confidentiality impact make this a priority for prompt remediation in any exposed Langflow Desktop deployment.

Recommended defensive actions

  • Review the IBM PSIRT advisory for vendor remediation guidance and any fixed releases or compensating controls.
  • Restrict or disable public/network access to Langflow Desktop until remediation is applied.
  • Verify whether deployed instances are within the affected range 1.0.0 through 1.8.4.
  • Audit image-access flows and object references for authorization checks tied to user identity rather than user-controlled keys.
  • Apply the vendor-recommended update or mitigation as soon as it is available.
  • Monitor for unauthorized access to user content and review access logs for unusual image retrieval activity.

Evidence notes

This debrief is based only on the supplied NVD record and its IBM PSIRT reference. Supported facts include the CVE ID, affected product/version range, CVSS vector and score, CWE-639 classification, and the vendor advisory link. No additional remediation specifics were provided in the source corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-4503 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-4503

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

  • CVE-2026-4503 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-4503

    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.