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Back to active CVEs
Medium · CVSS 5.4CVE-2026-8355

IBM ContextForge MCP Gateway is affected by server-side request forgeryCVE-2026-8355

Answer in brief

CVE-2026-8355 records a Medium severity (CVSS 5.4) vulnerability in IBM ContextForge MCP Gateway is affected by server-side request forgery. The current sources do not mark it as known exploited. The current feed maps IBM/ContextForge MCP Gateway (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 19, 2026Updated Oct 20, 2026Source checked Oct 20, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/ContextForge MCP Gateway (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
IBM/ContextForge MCP Gatewaygeneric>=0.1.0 <=1.0.5Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for IBM/ContextForge MCP Gateway.
  2. 2Review the reported fix. Source-reported solution: IBM strongly recommends addressing the vulnerability now. Product(s)Version(s) number and/or range Remediation/Fix/InstructionsIBM ContextForge MCP Gateway 2.0>=v1.0.6Upgrade to v1.0.6 or later. See release notes:  https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.6 https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.6%29

Evidence timeline and material changes

  1. Published upstream

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 20, 2026

Sources and claim methodology

  • Source referenceibm.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • SolarWinds Observability Self-Hosted Server-Side Request Forgery (SSRF)Also CWE-918

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-918
Source
CVE List V5
Source checked
Oct 20, 2026
References
1 linked source
Open source record