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TI-2026-39928 Aliases CVE-2026-55255GHSA-qrpv-q767-xqq2

Authorization bypass in langflow

Priority CRITICAL 96Exploited in the wildCWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2026-07-07CISA due date 2026-07-10
EPSS 0.00887 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed langflow (langflow-ai): 1.9.1langflow (PyPI): 1.9.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Langflowlangflowbefore 1.9.11.9.1Patch availableCNA
—langflow (PyPI)before 1.9.11.9.1Patch availableGHSA-qrpv-q767-xqq2
  • langflow VendorLangflow Affected before 1.9.1 Fixed in 1.9.1 Patch available CNA
  • langflow (PyPI) Vendor— Affected before 1.9.1 Fixed in 1.9.1 Patch available GHSA-qrpv-q767-xqq2

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*before 1.9.1VulnerableLangflow
  • cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:* Versions before 1.9.1 Vulnerable ·Langflow

Remediation

  • Fix · CNA langflow (langflow-ai) Fixed in 1.9.1
  • Fix · GHSA-qrpv-q767-xqq2 langflow (PyPI) Fixed in 1.9.1 Advisory →

Timeline

  1. 2026-07-07 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2026-55255
  3. 2026-10-03 Alias added: GHSA-qrpv-q767-xqq2
  4. 2026-10-07 CISA SSVC decision points changed

References

Exploit 1

Patch 2

Advisory 2

Other 3

  • TI-2026-08085 Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-00553 Langflow exec_globals Inclusion of Functionality from Untrusted Control Sphere Remote… KEVCVSS 3.0CRITICAL 9.8
  • TI-2025-24427 Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE KEVCVSS 4.0CRITICAL 9.4
  • TI-2025-02845 Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-25463 Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint KEVCVSS 4.0CRITICAL 9.3
  • TI-2026-22309 Langflow has Remote Code Execution in CSV Agent CVSS 3.1CRITICAL 9.8
See all 216 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences