CVE-2026-55255

Name: CVE-2026-55255
Creator: NVD / NIST
Published: 2026-06-23T17:17:08.05+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 0.23%

Last modified Jun 24, 2026

CVE-2026-55255 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, 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 1.9.2.

Metrics

CVSS 3.1

9.9/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

EPSS Probability

0.23%

14.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Langflow	Langflow	< 1.9.2

References

https://github.com/langflow-ai/langflow/pull/12832Issue Tracking, Patch
https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2Vendor Advisory, Exploit, Mitigation
https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2Vendor Advisory, Exploit, Mitigation

Timeline

Published: Jun 23, 2026
Last Modified: Jun 24, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-55255?

How severe is CVE-2026-55255?

CVE-2026-55255 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2026-55255?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-55255?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST