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archive/Patch now/AIR-2026-1255
closedclosed 5 Aug 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-8446: Authentication Bypass in Langflow OSS MCP Composer Endpoint

Langflow OSS

An authentication bypass vulnerability affects the Model Context Protocol composer endpoint in Langflow OSS versions 1.0.0 through 1.10.3. No active exploitation has been confirmed.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
7.5
EPSS
<0.01 · top 58% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
5 Aug 2026
last update
5 Aug 2026
CVE ids
CVE-2026-8446other records

Timeline · 1

  1. 5 Aug 2026CVE-2026-8446: IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer…

Sources · 1

Advisories and databases

  1. 2026-08-05
    CVE-2026-8446: IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-8446

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
auth-bypassmcp
dates
happened 5 Aug 2026 · first reported 5 Aug 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-8446: Authentication Bypass in Langflow OSS MCP Composer Endpoint

https://gcdradar.vercel.app/incidents/cve-2026-8446-authentication-bypass-in-langflow-oss-mcp-comp · AIR-2026-1255 · closed 2026-08-05

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-08-05
- AI role: Attack on AI
- Products: Langflow OSS
- CVE ids: CVE-2026-8446
- CVSS: 7.5

## Summary

An authentication bypass vulnerability affects the Model Context Protocol composer endpoint in Langflow OSS versions 1.0.0 through 1.10.3. No active exploitation has been confirmed.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-08-05: CVE-2026-8446: IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer… (https://nvd.nist.gov/vuln/detail/CVE-2026-8446)

## Sources

- 2026-08-05 NVD: CVE-2026-8446: IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer… https://nvd.nist.gov/vuln/detail/CVE-2026-8446

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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