High severity · published Oct 19, 2026
CVE-2026-107366
Langflow OSS Authorization Bypass Through User-Controlled Key
8.3
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LO
Langflow OSS · IBM
1.0.0 through 1.12.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107366
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107366
www.ibm.com
https://www.ibm.com/support/pages/node/7293016
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