Exploited vulnerability

CVE-2026-55255

TLP:CLEAR

Langflow Authorization Bypass Through User-Controlled Key Vulnerability

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.

Facts

Vendor: Langflow
Product: Langflow
CVSS: 9.9
EPSS (probability of exploitation within 30 days): 0.9 %
On CISA's Known Exploited Vulnerabilities list since: 7 July 2026
First known exploitation: 7 July 2026
CISA's deadline for US federal agencies: 10 July 2026
Weakness: CWE-639
First seen by Risk Letters: 23 June 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD