11 June 2026
Reference: CVE-2026-5027
1. What is being reported?
The problem is with a part of Langflow that handles file uploads. It does not properly check the file names sent to it, allowing attackers to use special characters to save files outside the intended folders. This can let them run harmful programs on the system without needing to log in.
2. What this means in plain English
If your organisation uses Langflow, attackers could exploit this flaw to take control of your systems remotely. This could lead to data theft, disruption of services, or damage to your IT environment. Even if you do not use Langflow directly, if your IT provider uses it or similar tools, there could be a risk.
3. Could this affect a small business?
Small businesses and charities using Langflow for AI development or related tasks are at risk. Those not using this software or similar AI platforms are unlikely to be affected. Check with your IT provider if you are unsure.
4. What to do now
- Ask your IT provider if Langflow is used in your organisation or by your service providers.
- Ensure that any Langflow software is updated with the latest security patches as soon as they are available.
- Avoid uploading files to Langflow until the vulnerability is confirmed fixed.
- Monitor your systems for unusual activity and report any concerns to your IT support immediately.
5. Ask your IT provider
Can you confirm whether Langflow is used in our systems or by our service providers, and if so, has the CVE-2026-5027 vulnerability been patched?
6. Bottom line
If you use Langflow, act quickly to check and update it to prevent attackers from gaining control of your systems.
Information based on CISA KEV, NVD and reputable security news reports.