Medium severity · published Sep 14, 2026
CVE-2026-12763
Langflow is vulnerable to authentication bypass and insufficient session expiration
4.2
CVSS
0.2%
EPSS
No
On KEV
Description
IBM Langflow OSS 1.0.0 through 1.11.5 could allow an authenticated attacker to access another user's MCP server context due to improper cache key isolation in the MCP Tools component.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% 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 1.11.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12763
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-12763
www.ibm.com
https://www.ibm.com/support/pages/node/7286662
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