{
  "schema_version": "1.6.0",
  "id": "ACVE-2026-0005",
  "aliases": [
    "CVE-2026-50548",
    "CVE-2026-50549"
  ],
  "published": "2026-09-19T00:00:00Z",
  "modified": "2026-09-19T00:00:00Z",
  "summary": "Cursor prompt injection can reach tools outside the intended sandbox",
  "details": "## What the vulnerability is\n\nCursor prompt injection can reach tools outside the intended sandbox boundary. The advisory summary identifies the security concern, but the current reference set does not establish a complete affected-version range or reproduce the prompt-delivery path. The lockfile record should therefore be used as a possible exposure signal.\n\n## Which configuration is exposed\n\nThe matcher requires `harness.id` `cursor`, a version below `<999.0.0>`, and the presence of a `sandbox` field. It does not encode a particular sandbox policy, project, prompt, tool, repository, or model. A configured sandbox is the harness condition that makes this rule relevant; the matcher intentionally does not claim that every sandbox configuration is escapable.\n\n## How ACVE detects it\n\nACVE reads `harness.id`, `harness.version`, and the existence of `sandbox`. It cannot reproduce prompt delivery, inspect the sandbox's allowed paths or capabilities, or show that a tool actually crossed the boundary. The finding is deliberately broad until the affected release and exploit preconditions are grounded.\n\n## Fix\n\n1. Keep Cursor's sandbox configuration restrictive and review its allowed paths and capabilities.\n2. Treat repository instructions and other untrusted content as untrusted input; review tool requests before allowing them to act outside the project.\n3. Run grounding before selecting an upgrade target, then install the confirmed fixed release.\n\n## Grounding needed\n\n`acve advisory ground` must confirm the affected Cursor range, fixed release, and the prompt-injection-to-sandbox behavior represented by `CVE-2026-50548` and `CVE-2026-50549`.\n\nThe sandbox action is a precaution while the release boundary and prompt-delivery conditions remain unresolved.\n\n## References\n\nSee `references` for primary sources.",
  "affected": [
    {
      "package": {
        "ecosystem": "AgentHarness",
        "name": "cursor"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50548"
    },
    {
      "type": "REPORT",
      "url": "https://example.com/research/acve"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pickbitsai/acve/issues?q=CVE-2026-50548"
    }
  ],
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "8"
    }
  ],
  "database_specific": {
    "severity": "HIGH",
    "acve": {
      "specVersion": 1,
      "status": "candidate",
      "vulnClasses": [
        "prompt-injection-to-tool",
        "sandbox-escape"
      ],
      "cwe": [
        "CWE-94"
      ],
      "taxonomy": {
        "owasp_asi": [
          "ASI01 Agent Goal Hijack"
        ],
        "atlas": [
          "AML.T0051"
        ]
      },
      "matcher": {
        "all": [
          {
            "field": "harness.id",
            "op": "eq",
            "value": "cursor"
          },
          {
            "field": "harness.version",
            "op": "semverRange",
            "value": "<999.0.0"
          },
          {
            "field": "sandbox",
            "op": "exists"
          }
        ]
      },
      "fix": {
        "summary": "Keep Cursor sandboxed and upgrade after the affected range is confirmed.",
        "actions": [
          {
            "type": "reconfigure",
            "target": "settings:cursor:sandbox",
            "to": "restrictive",
            "why": "Limit tool execution while the prompt-injection exposure is being grounded."
          }
        ]
      },
      "exposure": "local",
      "exploitation": {
        "vector": "malicious project or server configuration",
        "userInteraction": "required",
        "kev": false
      },
      "grounding": {
        "osv": {
          "checkedAt": "2026-09-20T02:43:28Z",
          "found": false,
          "aliasesConfirmed": [],
          "packagesConfirmed": [],
          "fixedVersionsConfirmed": [],
          "cvss": []
        },
        "nvd": {
          "checkedAt": "2026-09-20T02:43:28Z",
          "found": false,
          "cvss": null,
          "published": null
        },
        "kev": {
          "checkedAt": "2026-09-20T02:43:28Z",
          "listed": false
        },
        "registry": {
          "checkedAt": "2026-09-20T02:43:28Z",
          "confirmed": [],
          "missing": []
        }
      }
    }
  }
}