Medium severity · published Sep 15, 2026
CVE-2026-11918
IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures
5.4
CVSS
0.3%
EPSS
No
On KEV
Description
IBM ContextForge MCP Gateway <= v1.0.4 IBM mcp-context-forge could allow an authenticated user to bypass protection mechanisms due to incomplete recursive inspection of nested payload content.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
ContextForge MCP Gateway · IBM
<= v1.0.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11918
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-11918
www.ibm.com
https://www.ibm.com/support/pages/node/7285720
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