CVE-2026-7663

Description

IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.

CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0026

Probability of exploitation

0.17%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-285 CWE-285

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
langflow	langflow	1.0.0 — 1.10.0

References

Advisories & Patches

https://www.ibm.com/support/pages/node/7277570

Frequently Asked Questions

What is CVE-2026-7663? +

IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-7663? +

CVE-2026-7663 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0026, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-7663? +

CVE-2026-7663 affects products from langflow, specifically: langflow. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-7663? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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