HighVulnerability

CVE-2026-8446: IBM Langflow OSS authentication bypass in MCP composer endpoint

Source: NVD(opens in a new tab)
Identifier: CVE-2026-8446
Published: August 5, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.5%

Summary

CVE-2026-8446 is an authentication bypass in IBM Langflow OSS versions 1.0.0 through 1.10.3. The flaw sits in the Model Context Protocol (MCP) composer endpoint when mcp_composer_enabled=true, which is the default, and projects are configured with auth_type=oauth. It is classified as CWE-306, Missing Authentication for Critical Function, and IBM is the listed source. NVD had not yet provided an assessment at the time of the source text.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 7.5(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: none
EPSS: 0.5%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 9, 2026.
Disclosure date: August 5, 2026

Weaknesses and techniques

Weakness (CWE): CWE-306
Attack pattern (CAPEC): CAPEC-115

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: Framework
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-8446

First tracked: August 5, 2026 at 02:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 85% (self-assessed)

Topics

Model Context Protocol

Summary

Mitigation

Topics

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