CVE-2026-55255 KEV
8.4
HIGH · CVSS 3.1 · EPSS 0.9% (pctl 58)
Patch first
On CISA KEV — known exploited in the wild, due 2026-07-10.
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.
Scoring
| CVSS | 8.4 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L |
| EPSS | 0.89% — more likely to be exploited than 58% of all CVEs |
| Weakness | CWE-639 |
| On CISA KEV | yes — remediate by 2026-07-10 |
| Public exploit | none known |
| Published | 2026-06-23 |
| Last modified | 2026-07-08 |
CISA KEV
| Name | Langflow Authorization Bypass Through User-Controlled Key Vulnerability |
|---|---|
| Added | 2026-07-07 |
| Due | 2026-07-10 |
| Vendor / product | Langflow / Langflow |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| langflow | langflow |
References
- https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e
- 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
- https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255
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