Skip to main content
Meet us at Black Hat USA 2026— Las Vegas, August 1–6Book a Meeting
Mallory
Back to vulnerabilities
Unrated

Unauthenticated MCP Resource Access and Operation Execution in IBM Langflow OSS

IdentifiersCVE-2026-7664CWE-285

CVE-2026-7664 is a critical improper authorization vulnerability in IBM Langflow OSS affecting versions 1.0.0 through 1.8.4. The flaw is in the Streamable MCP transport endpoint, where authorization enforcement is insufficient, allowing requests to reach protected MCP project resources without proper access control checks. As a result, an unauthenticated remote attacker can access protected MCP project resources and execute MCP operations over the network without requiring privileges or user interaction.

Share:
For your environment

Are you exposed to this one?

Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.

Start free trial
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 can allow a remote unauthenticated attacker to access protected MCP project resources and invoke MCP operations that should require authorization. Based on the provided severity metadata, the vulnerability has high confidentiality, integrity, and availability impact, meaning exploitation may expose sensitive project data, permit unauthorized modification or execution of MCP-related actions, and potentially disrupt service or project operations.

Mitigation

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

Until patching is completed, restrict network access to the Streamable MCP transport endpoint and protected MCP project resources to trusted users and administrative boundaries only. If possible, place the affected service behind authentication-enforcing reverse proxies, VPNs, IP allowlists, or other access-control layers to prevent unauthenticated reachability from untrusted networks.

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 enforcement issue 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.
Start free trial
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