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CVE-2026-55255: Langflow Authorization Bypass Through User-Controlled Key Vulnerability

criticalknown exploitedpublic exploitCVE-2026-55255
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: LangflowAuthentication bypass
What
Langflow contains an authorization bypass through user-controlled key vulnerability.
Who is affected
Authenticated users of Langflow.
Urgency
Remediation is urgent as the vulnerability is actively exploited and classified as critical.
Action
Implement the recommended updates to fix the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-07-07
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55255

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-55255coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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