HighVulnerabilityLLM-specific

CVE-2026-107366: IBM Langflow OSS message endpoints lack ownership verification

Source: NVD(opens in a new tab)
Identifier: CVE-2026-107366
Published: October 19, 2026
Record updated: October 20, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.

Summary

IBM Langflow OSS versions 1.0.0 through 1.12.4 contain three message endpoints that do not verify ownership. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or take over an entire conversation session by reassigning its session ID.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 8.3(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Attack vector: network
Attack complexity: low
Privileges required: low
User interaction: none
EPSS: Not scored. FIRST had not published an EPSS score for this CVE when it was last checked on October 20, 2026.
Disclosure date: October 19, 2026

Weaknesses and techniques

Weakness (CWE): CWE-639
AI threat technique (MITRE ATLAS): AML.T0051

Classification

Attack type: Prompt injection,
Other
Attack sophistication: Trivial
AI component targeted: Framework
Impact: Confidentiality,
Integrity,
Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-107366

First tracked: October 20, 2026 at 02:13 AM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Summary

Mitigation

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