Vulnerability Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the `_read_flow` helper in `src/backend/base/langflow/api/v1/flows.py` branched on the `AUTO_LOGIN` setting to decide whether to filter by `user_id`. When `AUTO_LOGIN` was `False` (i.e., authentication was enabled), neither branch enforced an ownership check — the query returned any flow matching the given UUID regardless of who owned it. This allowed any authenticated user to read any other user's flow, including embedded plaintext API keys; modify the logic of another user's AI agents, and/or delete flows belonging to other users. The vulnerability was introduced by the conditional logic that was meant to accommodate public/example flows (those with `user_id = NULL`) under auto-login mode, but inadvertently left the authenticated path without an ownership filter. The fix in version 1.5.1 removes the `AUTO_LOGIN` conditional entirely and unconditionally scopes the query to the requesting user.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Langflow | Langflow | < 1.5.0 |
| Langflow | Langflow-Base | < 0.5.1 |
Related Weaknesses (CWE)
References
- https://github.com/langflow-ai/langflow/pull/8956Issue TrackingPatch
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-8c4j-f57c-35cfPatchVendor Advisory
FAQ
What is CVE-2026-34046?
CVE-2026-34046 is a vulnerability with a CVSS score of 8.8 (HIGH). Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the `_read_flow` helper in `src/backend/base/langflow/api/v1/flows.py` branched on the `AUTO_LOGI...
How severe is CVE-2026-34046?
CVE-2026-34046 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34046?
Check the references section above for vendor advisories and patch information. Affected products include: Langflow Langflow, Langflow Langflow-Base.