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Vulnerabilities

Vulnerability · CVE-2026-34046

Langflow is a tool for building and deploying AI-powered agents and workflows.

Published Mar 27, 2026 · catalog updated Jun 17, 2026 · Langflow is a tool

Check if you run it

No confirmed exploitation is on record for CVE-2026-34046. EPSS is 0.68%. Act only if a listed version of Langflow is a tool is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Langflow is a tool).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.68%
Remediation
Advisory link
Affected products
cpe langflow/langflow · cpe langflow/langflow-base

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the helper in branched on the setting to decide whether to filter by . When was (i.e., authentication was enabled), neither branch enforced an ownership check — the query returned any flow matching the given UUID regardless of who owned it. This allowed any authenticated user to read any other user's flow, including embedded plaintext API keys; modify the logic of another user's AI agents, and/or delete flows belonging to other users. The vulnerability was introduced by the conditional logic that was meant to accommodate public/example flows (those with ) under auto-login mode, but inadvertently left the authenticated path without an ownership filter. The fix in version 1.5.1 removes the conditional entirely and unconditionally scopes the query to the requesting user.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe langflow/langflow1.5.0
  • cpe langflow/langflow-baseversion unspecified

How to fix CVE-2026-34046

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-34046. EPSS is 0.68%. Act only if a listed version of Langflow is a tool is installed.

Which versions are affected?

Compare what you have installed with 1.5.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-639: Authorization Bypass Through User-Controlled Key; CWE-862: Missing Authorization. EPSS 0.68%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 27, 2026 · NIST NVD

    Detected

    Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the helper in branched on the setting to decide whether to filter by . When was (i.e., authentication was enabled), neither branch enforced an ownership check — the query returned any flow matching the given UUID regardless of who owned it. This allowed any authenticated user to read any other us

  2. Jun 17, 2026 · NIST NVD

    Updated

    Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the helper in branched on the setting to decide whether to filter by . When was (i.e., authentication was enabled), neither branch enforced an ownership check — the query returned any flow matching the given UUID regardless of who owned it. This allowed any authenticated user to read any other us

Sources

  • CVE.orgVulnerability recordCVE-2026-34046

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-34046

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-34046

    Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the helper in branched on the setting to decide whether to filter by . When was `Fals

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.