CVE-2026-55255

HIGHCVSS 8.4Known Exploited

CISA Known Exploited Vulnerability

https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-55255

Remediation deadline: July 10, 2026

Description

Langflow contains an authorization bypass through user-controlled key vulnerability which allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request.

Timeline

Published:June 23rd, 2026 9:17 PM

Last modified:July 8th, 2026 5:39 PM

Added to KEV:July 7th, 2026

CVSS Scoring

CVSS v3: 8.4 (HIGH)

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

Affected Software

From NVD CPE configuration data

Vendors

langflow

Products

langflow

Weaknesses (CWE)

CWE-639

References & Reports

Advisories, patches, and third-party reports

Source: NIST NVD · Data may lag official sources by up to one minute