What is CVE-2026-18905?

CVE-2026-18905 is a high-severity vulnerability in IBM Contextforge, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-09-04.

How severe is CVE-2026-18905?

High severity. CVSS v3 base score is 7.7 out of 10.

SSRF in IBM Contextforge

CVE-2026-18905

IBM ContextForge MCP Gateway (`mcp-contextforge-gateway`) <= v1.0.6 MCP Context Forge could allow a remote authenticated attacker to obtain sensitive information due to a DNS rebinding vulnerability during tool invocation.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-09-04 · last modified 2026-09-15.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.8th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

IBM Contextforge
IBM Contextforge Mcp Gateway (`mcp-Contextforge-Gateway`) — versions <= v1.0.6

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

www.ibm.com/support/pages/node/7286053 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-18905?: CVE-2026-18905 is a high-severity vulnerability in IBM Contextforge, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-09-04.
How severe is CVE-2026-18905?: High severity. CVSS v3 base score is 7.7 out of 10.