CVE-2026-4503: IBM Langflow Desktop Exposes User Images via IOR
The National Vulnerability Database has disclosed CVE-2026-4503, a high-severity vulnerability (CVSS 7.5) affecting IBM Langflow Desktop versions 1.0.0 through 1.8.4. This flaw, categorized as CWE-639 (Incorrect Authorization), allows an unauthenticated user to view images belonging to other users.
The vulnerability stems from an indirect object reference (IOR) where a user-controlled key can be manipulated to bypass access controls. This means an attacker doesn’t need to authenticate to the system; they can simply craft a request to access images that should otherwise be protected.
For defenders, this is a clear data exposure risk. While the immediate impact is image viewing, IOR vulnerabilities often hint at deeper authorization issues. It’s critical to understand what other data might be accessible if similar logic flaws exist elsewhere in the application or its underlying infrastructure.
What This Means For You
- If your organization uses IBM Langflow Desktop, immediately identify all instances running versions 1.0.0 through 1.8.4. Prioritize patching or upgrading to a secure version to mitigate the risk of unauthorized image exposure. Audit your Langflow deployments for any suspicious access patterns or unusual data requests.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-4503: IBM Langflow Desktop Image Disclosure via IOR
title: CVE-2026-4503: IBM Langflow Desktop Image Disclosure via IOR
id: scw-2026-04-30-ai-1
status: experimental
level: high
description: |
This rule detects attempts to access user images in IBM Langflow Desktop by exploiting CVE-2026-4503. The vulnerability allows unauthenticated users to view other users' images via an indirect object reference. This detection specifically looks for GET requests to the '/api/v1/images/' endpoint, which is indicative of this exploit.
author: SCW Feed Engine (AI-generated)
date: 2026-04-30
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-4503/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/api/v1/images/'
cs-method:
- 'GET'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-4503 | Information Disclosure | IBM Langflow Desktop versions 1.0.0 through 1.8.4 |
| CVE-2026-4503 | IDOR | Unauthenticated user can view other users' images via indirect object reference through a user-controlled key |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 01, 2026 at 00:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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