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Improper Authorization in IBM Langflow OSS Streamable MCP Transport Endpoint

IdentifiersCVE-2026-7664CWE-285

CVE-2026-7664 is a critical improper authorization vulnerability affecting IBM Langflow OSS versions 1.0.0 through 1.8.4. The flaw is in the Streamable MCP transport endpoint, where authorization enforcement is insufficient. As a result, unauthenticated remote attackers can access protected MCP project resources and execute MCP operations without being properly authorized. The issue is remotely exploitable over the network and does not require user interaction or prior authentication.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an unauthenticated attacker to bypass intended access controls on MCP-related functionality in Langflow OSS. This can expose protected MCP project resources and permit execution of MCP operations, resulting in high confidentiality, integrity, and availability impact. Based on the provided severity data, the vulnerability is critical with CVSS v3.1 9.8.

Mitigation

If you can’t patch tonight, do this now.

Until patching is completed, restrict network access to the Streamable MCP transport endpoint and limit access to MCP project resources to trusted users and systems only. If possible, place the affected service behind strong authentication and network-layer access controls to reduce exposure of the vulnerable endpoint.

Remediation

Patch, then assume compromise.

Upgrade IBM Langflow OSS to a fixed version newer than 1.8.4 once the vendor-provided fix is available. Apply IBM/vendor security patches addressing the improper authorization flaw in the Streamable MCP transport endpoint. Validate that the deployed version is no longer within the affected range of 1.0.0 through 1.8.4.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
International Business MachinesLangflowapplication
International Business MachinesLangflow Ossapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

6 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity5

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-7664
NVD
nvd.nist.gov/vuln/detail/CVE-2026-7664
MITRE CWE · CWE-285
cwe.mitre.org