CVE-2026-11918
IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures
02 Description
IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload structures
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.27% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 19.4% of scored records. A rank, not a probability.
- NVD base score
- 5.4 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-09-20.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-09-15 17:28Z1 MO AGO
- Last updated
- 2026-09-20 00:45Z1 MO AGO
- Reserved
- 2026-06-10
- Assigning CNA
- ibm
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.4)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Weaknesses
- CWE-184Incomplete List of Disallowed InputsBase
- Data version
- 5.2
- Document digest
- f0a91262974a7e828fc1a8ed9f8e1ebe374bb93c603cff7b68c226fd5bc07633
05 Affected products
06 References
07 Remediation
| Product | Affected Version(s) | Fix Version | Instructions | |---|---|---|---| | | <=1.0.4 | 1.0.5 | Upgrade to v1.0.5 or later. . | IBM strongly recommends addressing the vulnerability now. Product(s)Version(s) number and/or range Remediation/Fix/InstructionsIBM ContextForge MCP Gateway<=1.0.4 v1.0.5 or later See [release notes]( https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.5) https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.5%29 Note: <Component A / B names> are bundled with <Product profile name> to provide <feature / function description>