IBM ContextForge MCP Gateway is affected by server-side request forgery
IBM ContextForge MCP Gateway 0.1.0 through 1.0.5 is vulnerable to a server-side request Forgery (SSRF) that allows authenticated users with gateway creation privileges to perform arbitrary HTTP POST requests to internal network resources and cloud metadata endpoints. The vulnerability occurs during OAuth-enabled gateway registration when the system fails to validate the oauth_config.token_url parameter. When registering a gateway with OAuth client credentials authentication, an attacker can supply a malicious token_url pointing to internal services, cloud metadata endpoints (AWS IMDSv1, GCP, Azure), or localhost-bound services. The application immediately performs an HTTP POST request to the attacker-controlled URL with form-encoded credentials in the body. If the response cannot be parsed as a valid OAuth token response, up to 256 characters of the response body are reflected back to the attacker in the HTTP 502 error message. This vulnerability bypasses existing SSRF protections that are applied to the gateway.url field but not to OAuth configuration parameters.
CVE-2026-8355
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-8355
ContextForge MCP Gateway
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "IBM",
"product": "ContextForge MCP Gateway",
"versions": [
{
"status": "affected",
"version": "0.1.0",
"versionType": "semver",
"lessThanOrEqual": "1.0.5"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-8355
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #42219 · Revision 1
- Added to Heist Feed
- Publisher date