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Vulnerabilities

Vulnerability · CVE-2026-107366

IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification.

Published Oct 20, 2026 · catalog updated Nov 3, 2026 · IBM Langflow OSS 1.0.0

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-107366. EPSS is 0.30%. Act only if a listed version of IBM Langflow OSS 1.0.0 is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (IBM Langflow OSS 1.0.0).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.30%
Remediation
Version ranges on file
Affected products
cpe langflow/langflow

IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

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/langflow< 1.12.5

How to fix CVE-2026-107366

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-2026-107366. EPSS is 0.30%. Act only if a listed version of IBM Langflow OSS 1.0.0 is installed.

Which versions are affected?

Compare what you have installed with < 1.12.5. 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. EPSS 0.30%. 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.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 20, 2026 · NIST NVD

    Detected

    IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

  2. Oct 20, 2026 · NIST NVD

    Updated

    IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

  3. Oct 20, 2026 · NIST NVD

    Updated

    IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

  4. Oct 21, 2026 · NIST NVD

    Updated

    IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

  5. Nov 3, 2026 · NIST NVD

    Updated

    IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

Sources

  • CVE.orgVulnerability recordCVE-2026-107366

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-107366

    30-day exploitation probability 0.30%

    first.org
  • NIST NVDVulnerability recordCVE-2026-107366

    IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassi

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • NIST NVDNov 3, 2026
  • FIRST EPSSNov 3, 2026
  • CVE.orgOct 21, 2026