CVE-2026-107366 IBM Langflow OSS - Broken Access Control

IBM Langflow OSS 1.0.0 through 1.12.4 contains broken access control caused by lack of ownership verification in message endpoints, letting authenticated users delete or modify others' messages and hijack sessions, exploit requires authentication.

CVSS base score 8.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Data Tampering, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Published
20 October 2026
Updated
20 October 2026
Weakness
CWE-639

Vendor fix

Update to the latest version beyond 1.12.4.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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