GHSA-q567-cr4x-96w4: Trigger.dev Blind SSRF Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q567-cr4x-96w4",
  "modified" : "2026-10-02T22:35:31Z",
  "published" : "2026-10-02T22:35:31Z",
  "aliases" : [ ],
  "summary" : "Trigger.dev: Blind SSRF via alert-channel webhook",
  "details" : "### Summary\n\nA WEBHOOK alert channel stores a user-supplied `url`. When an alert fires (deployment/run failure, error groups), the webapp server (`alertsWorker` -> `DeliverAlertService`) POSTs the HMAC-signed alert payload to that URL via `fetch(webhook.url, ...)`. The URL is never validated against a host allowlist or private-IP/metadata blocklist (a repo-wide search for `169.254`, `isPrivate`, `isLoopback`, `net.isIP`, `ssrf` returns ZERO hits), and the API route's URL field is just `z.string().optional()` (no syntax check at all). So an authenticated tenant can point the webhook at internal infrastructure or `169.254.169.254` and the multi-tenant server fetches it.\n\n### Affected\n`apps/webapp`, HEAD `5d99457` (current main).\n\n### Root cause\n- Source (API route): `app/presenters/v3/ApiAlertChannelPresenter.server.ts` `ApiAlertChannelData.url = z.string().optional()` (no host validation); route `app/routes/api.v1.projects.$projectRef.alertChannels.ts` (PAT-auth).\n- Store: `app/v3/services/alerts/createAlertChannel.server.ts` persists `{url, secret, version}` verbatim.\n- Sink: `app/v3/services/alerts/deliverAlert.server.ts:973` `fetch(webhook.url, {method:\"POST\", headers:{\"x-trigger-signature-hmacsha256\":...}, body:rawPayload})`; identical at `deliverErrorGroupAlert.server.ts:258`. Runs inside the webapp process; `fetch` follows redirects (IMDSv1-via-redirect). No egress guard anywhere.\n\n### Runtime PoC (proven on self-host)\nSeeded a project + STAGING env + a WEBHOOK channel with `url=http://host.docker.internal:7766/...` (an internal address from the server's POV) + a DEPLOYING deployment. Triggered via the public API `POST /api/v1/deployments/deployment_ssrfpoc/fail` -> 200 -> FAILED -> alertsWorker -> the server fetched the listener. Captured:\n```\nPOST /ssrf-via-webhook HTTP/1.1\nhost: host.docker.internal:7766\nx-trigger-signature-hmacsha256: <redacted>\nuser-agent: node\n{\"type\":\"alert.deployment.failed\", ...}\n```\nThe webapp server (user-agent: node) made an outbound POST to the attacker-chosen internal URL; 169.254.169.254 / any internal host works identically.\n\n### Severity\n`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N` ~ Medium. Blind (response not reflected) + POST-only (fixed body = signed alert payload), so it enables internal port/host scanning (delivery success/timing oracle), state-changing POSTs to internal services, and IMDSv1-via-redirect — not arbitrary GET exfiltration. PR:L (authenticated tenant). Egress private-IP/metadata blocking on server-issued webhooks is industry standard; its absence is the defect.\n\n### Suggested fix\nValidate the webhook URL on create (require http(s), resolve host, reject private/link-local/loopback/metadata ranges) AND re-check at fetch time (re-resolve after redirects or disable redirects / pin to resolved public IP). A shared `assertPublicUrl(url)` used by `createAlertChannel` + the two delivery sinks.\n\n### Dup\nDistinct CWE-918 class from the IDOR advisories. FRESH. (The Grav maintainer independently hardened the same webhook-URL-SSRF class in grav-plugin-api commit dfcc947 on 2026-06-26 — corroborating the class is real and fixable.)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "trigger.dev"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.5.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.5.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/triggerdotdev/trigger.dev/security/advisories/GHSA-q567-cr4x-96w4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/triggerdotdev/trigger.dev/pull/4199"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/triggerdotdev/trigger.dev/commit/34b1a181c2a1d33a53ebab88f84b05f81fea4254"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/triggerdotdev/trigger.dev"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/triggerdotdev/trigger.dev/releases/tag/v4.5.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-02T22:35:31Z",
    "nvd_published_at" : null
  }
}