CriticalVulnerability

CVE-2026-7663: IBM Langflow OSS unauthenticated access to MCP project resources

Source: NVD(opens in a new tab)
Identifier: CVE-2026-7663
Published: June 30, 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-2026-7663 affects IBM Langflow OSS versions 1.0.0 through 1.9.6. The flaw is improper authorization enforcement in the Streamable MCP transport endpoint, which allows unauthenticated attackers to access protected MCP project resources and execute MCP operations. The weakness is classified as CWE-285 (Improper Authorization), and NVD had not yet provided an assessment at the time of publication.

Mitigation

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

Details

Scores and exploitation

CVSS score: 9.1(critical)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 October 13, 2026.
Disclosure date: June 30, 2026

Weaknesses and techniques

Weakness (CWE): CWE-285

Classification

Attack sophistication: Trivial
AI component targeted: Agent
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-2026-7663

First tracked: June 30, 2026 at 08:09 PM ET, from NVD/CVE Database

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

Classifier confidence: 90% (self-assessed)

Topics

Model Context Protocol