CVE-2026-9186 IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration installation by spoof
Medium 6.5
Published
Updated
Check this codebase for CVE-2026-9186 and fix it if it is affected.
What it is: CVE-2026-9186 is a medium-severity vulnerability in Langflow Langflow, published on 4 Sep 2026.
Exploitation: There is no known exploitation of CVE-2026-9186 in the wild and no public exploit code.
Affected product: Langflow Langflow. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-9186/ (Markdown: https://insights.sbomify.com/CVE-2026-9186/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-9186?
CVE-2026-9186 is a medium-severity vulnerability in Langflow Langflow, published on 4 Sep 2026.
Official description
IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration installation by spoofing X-Forwarded-For: 127.0.0.1 header, enabling arbitrary writes to IDE config files (~/.cursor/mcp.json, etc.).
Weakness: CWE-284
Which versions are affected by CVE-2026-9186?
It affects 1 product.
Products include Langflow Langflow.
How do I fix CVE-2026-9186?
No fix has been published for CVE-2026-9186 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-9186 being exploited?
There is no known exploitation of CVE-2026-9186 in the wild and no public exploit code.
Other vulnerabilities in Langflow Langflow
Sources
Also known as GHSA-gqfh-c8pj-64mr.