# CVE-2026-55255: Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow

> CVE-2026-55255: Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow. CVSS 8.4 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-55255
Last updated: 2026-10-07T19:17:38Z

- Published: 2026-06-23 16:28 UTC · Updated: 2026-10-07 19:17 UTC · Assigner: GitHub\_M
- CVSS: 8.4 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
- EPSS: 0.89%, 59th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-07-07, federal due date 2026-07-10, ransomware use: Unknown
- CWE: CWE-639

## Description

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.

## CISA required action

Apply 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.

## Affected vendors and products

- langflow-ai: langflow

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-55255)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-55255)
- [https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e](https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e)
- [https://github.com/langflow-ai/langflow/pull/12832](https://github.com/langflow-ai/langflow/pull/12832)
- [https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2](https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-55255 · Markdown: https://rewindex.com/cve/CVE-2026-55255.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-55255 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:50:17.135Z