# CVE-2026-4503: Unauthenticated Insecure Direct Object Reference (IDOR) Vulnerability in Langflow Desktop Image Download Endpoint

> Unauthenticated attackers can view other users' images via an insecure direct object reference in the image download endpoint.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Apr 2026
- **Updated:** 12 Jun 2026
- **Also known as:** GHSA-f8v3-8wm7-h9qr

## What is CVE-2026-4503?

CVE-2026-4503 is a high-severity vulnerability in IBM Langflow Desktop, published on 30 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow could allow an unauthenticated user to view other users' images due to an indirect object reference through a user-controlled key.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-4503?

It affects 1 product.


Products: Langflow Langflow Desktop.

## How do I fix CVE-2026-4503?

No fix has been published for CVE-2026-4503 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4503 being exploited?

There is no known exploitation of CVE-2026-4503 in the wild and no public exploit code.

## Other vulnerabilities in IBM Langflow Desktop

- [CVE-2026-6543](https://insights.sbomify.com/CVE-2026-6543/): Authenticated Remote Code Execution Vulnerability in Langflow Code Validation Endpoint (high 8.8)
- [CVE-2026-3340](https://insights.sbomify.com/CVE-2026-3340/): Server-Side Request Forgery (SSRF) in Langflow URL Component (medium 6.5)
- [CVE-2026-3345](https://insights.sbomify.com/CVE-2026-3345/): Path Traversal and Arbitrary File Write Vulnerability in IBM Langflow Desktop API v2 File Upload Endpoint (medium 6.5)
- [CVE-2026-4502](https://insights.sbomify.com/CVE-2026-4502/): Arbitrary File Write and Remote Code Execution Vulnerability in Langflow v2 API (medium 6.5)
- [CVE-2026-3346](https://insights.sbomify.com/CVE-2026-3346/): Stored Cross-Site Scripting (XSS) in Langflow Markdown Rendering via rehypeRaw (medium 6.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4503 and fix it if it is affected.

What it is: CVE-2026-4503 is a high-severity vulnerability in IBM Langflow Desktop, published on 30 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4503 in the wild and no public exploit code.

Affected product: IBM Langflow Desktop. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4503/ (Markdown: https://insights.sbomify.com/CVE-2026-4503/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4503
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4503
- OSV: https://osv.dev/vulnerability/CVE-2026-4503

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4503/
Summaries are generated and may contain mistakes; the official description above is the record.