Vulnerability Analysis
Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow
CVE-2026-55255
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 KEV
SSVC: Active Exploitation
CVSS Base Score
8.4
HIGH
Exploitability:1.8
Impact Score:6.0
Temporal Score:-
EPSS:0.47%
Threat Intelligence Signals
CISA KEV
YES
KEV Date Added
2026-07-07
Ransomware Use
Unknown
KEV Due Date
2026-07-10
VulnCheck In-the-Wild
No
Nuclei Template
No
EPSS Score
0.467%
EPSS Percentile
37.3th pct
GHSA ID
GitHub Severity
HIGH
SSVC Exploitation
Active
SSVC Automatable
No
Vulnerability Class
—
Identity & Timeline
| Status | - |
| Assigning Authority | - |
| CVSS Version / Source | - |
| Reserved | - |
| Published | - |
| Patch Date (date_public) | - |
| Exploit DB Date | - |
| First GitHub PoC Date | - |
| Last Updated | - |
| Time to Patch (Days to fix) | - |
| Exploit Release Gap | - |
| PoC Release Gap | - |
| Exploit DB References | None identified |
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| No affected products specified. | ||
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