# CVE-2026-4503: IBM Langflow Desktop IDOR in image download endpoint

Source: https://junglewise.ai/threats/cve-2026-4503-ibm-langflow-desktop-idor-in-image-download-endpoint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-30. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2026-4503 · Severity: high · CVSS 7.5 · Published 2026-04-30

IBM Langflow Desktop, a tool used for building AI workflows, contains a security flaw that allows unauthorized individuals to view images belonging to other users. By exploiting this vulnerability, an attacker could access sensitive visual data or proprietary information stored within the application without needing to log in. This could lead to data exposure and a breach of privacy for users of the platform.

Technologies: [IBM Langflow Desktop](https://junglewise.ai/threats/technologies/langflow-desktop). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-4503 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-4503 being exploited in the wild.

**How severe is CVE-2026-4503?** High severity, with a CVSS score of 7.5, published 30 April 2026.

**Which products and versions are affected?** IBM Langflow Desktop 1.0.0 - 1.8.4.

**Is there a fix for CVE-2026-4503?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-4503 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-4503?** Check whether you run IBM Langflow Desktop at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

IBM Langflow Desktop versions 1.0.0 through 1.8.4 are vulnerable to an Insecure Direct Object Reference (IDOR) in the image retrieval functionality. The endpoint 'GET /api/v1/files/images/{flow_id}/{file_name}' fails to enforce proper authentication and ownership validation. An unauthenticated remote attacker can exploit this by supplying a valid flow identifier and filename to retrieve image assets belonging to other users. This behavior is inconsistent with other file endpoints in the application which are properly protected. The vulnerability is addressed in version 1.9.0.

## Affected products

- IBM Langflow Desktop 1.0.0 - 1.8.4

## Timeline

- 2026-04-28: advisory: Initial publication of IBM security bulletin
- 2026-04-30: disclosed: CVE-2026-4503 published

## References

- [https://www.ibm.com/support/pages/node/7271099](https://www.ibm.com/support/pages/node/7271099)

## Related threats

- [IBM Langflow Desktop SSRF via DNS Rebinding](https://junglewise.ai/threats/cve-2026-3341-ibm-langflow-desktop-ssrf-via-dns-rebinding)
- [IBM Langflow Desktop code injection in code validation endpoint](https://junglewise.ai/threats/cve-2026-6543-ibm-langflow-desktop-code-injection-in-code-validation-endpoint)
- [IBM Langflow Desktop path traversal in API v2 file upload](https://junglewise.ai/threats/cve-2026-3345-ibm-langflow-desktop-path-traversal-in-api-v2-file-upload)
- [IBM Langflow Desktop path traversal in v2 API](https://junglewise.ai/threats/cve-2026-4502-ibm-langflow-desktop-path-traversal-in-v2-api)
- [IBM Langflow Desktop stored XSS in Markdown rendering](https://junglewise.ai/threats/cve-2026-3346-ibm-langflow-desktop-stored-xss-in-markdown-rendering)