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CVE-2026-8355

CVE-2026-8355

waiting for further signalsZero needs more public information before it can validate it.

GHSA-6f4r-8687-5x9p ↗EUVD-2026-104673 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
IBM ContextForge MCP Gateway >= 0.1.0, <= 1.0.5
CWE-918 Server-Side Request Forgery (SSRF)
ETK-2026-2180Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss5.4nvdCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
19h 32msince last run
28mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal (cve.org) +0hwaiting for further signals+13h41m
0
+2h
+4h
+6h
+8h
+10h

description

ContextForge MCP Gateway 0.1.0 through 1.0.5 can make server-originated requests to attacker-selected network destinations during OAuth-enabled gateway registration. An authenticated user with permission to create gateways could reach internal or cloud metadata services and may receive a limited portion of an invalid response.

mitigation

Restrict gateway-creation privileges and enforce outbound network controls that block the gateway from reaching internal administrative services and cloud metadata endpoints. No fixed version is recorded; apply a vendor update when one is published.

check
no
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
yes, low privileges
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
0.18%7th percentile
agent run time
28m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-19 23:42Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual: an exploit technique exists, but no deterministic check could cover this one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-10-19 23:42Z
    cve_org: trigger signal, started the run
    https://www.cve.org/CVERecord?id=CVE-2026-8355

this entry in the feed

GET /api/v1/feed/CVE-2026-8355

{
  "etk_id": "ETK-2026-2180",
  "cve_id": "CVE-2026-8355",
  "display_id": "CVE-2026-8355",
  "ghsa_id": "GHSA-6f4r-8687-5x9p",
  "euvd_id": "EUVD-2026-104673",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Server-side request forgery in ContextForge MCP Gateway",
  "summary": "ContextForge MCP Gateway 0.1.0 through 1.0.5 can make server-originated requests to attacker-selected network destinations during OAuth-enabled gateway registration. An authenticated user with permission to create gateways could reach internal or cloud metadata services and may receive a limited portion of an invalid response.",
  "mitigation": "Restrict gateway-creation privileges and enforce outbound network controls that block the gateway from reaching internal administrative services and cloud metadata endpoints. No fixed version is recorded; apply a vendor update when one is published.",
  "vendor": "IBM",
  "product": "ContextForge MCP Gateway",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0.1.0, <= 1.0.5"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "ContextForge MCP Gateway",
      "purl": null
    }
  ],
  "cwes": [
    918
  ],
  "cvss_score": 5.4,
  "cvss_src": "nvd",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
  "epss_score": 0.0018,
  "epss_percentile": 0.0736,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 27.787971966666667,
  "t0_at": "2026-10-19T23:42:01.778000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-19T23:42:01.778000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-19T23:42:01.778000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8355"
    }
  }
}

published 2026-10-20 12:55Z
last change 2026-10-21 08:08Z

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