CVE-2026-55255Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow
Updated under an hour ago ()
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It affects langflow-ai langflow and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jul 7, 2026; federal agencies had to remediate by Jul 10, 2026. Treat that date as your deadline.
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Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.1.
- CVSS
- 8.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
- Weakness (CWE)
- CWE-639
- Known exploited
- Added to CISA KEV Jul 7, 2026; federal remediation due Jul 10, 2026Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- EPSS (exploitation in the next 30 days)
- 0.89% (percentile 59)
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
langflow-ai langflow langflow_ai:langflow (from the name) | before 1.9.1 | CNA record |
langflow langflow langflow:langflow | before 1.9.1 | NVD |
References
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2x-refsource-confirm, exploit, mitigation, vendor-advisory
- https://github.com/langflow-ai/langflow/pull/12832x-refsource-misc, issue-tracking, patch
- https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060ex-refsource-misc, patch
- https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploitedthird-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.