A PinchTab Security Policy Bypass in /wait Allows Arbitrary JavaScript Execution

{
  "id": "452e72c4481abba869299f1e13f9b82568621f59e7d6e60fd5ae32628f47d66d",
  "url": "https://osv.dev/vulnerability/CVE-2026-33622",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "A PinchTab Security Policy Bypass in /wait Allows Arbitrary JavaScript Execution",
    "summary": "PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab `v0.8.3` through `v0.8.5` allow arbitrary JavaScript execution through `POST /wait` and `POST /tabs/{id}/wait` when the request uses `fn` mode, even if `security.allowEvaluate` is disabled. `POST /evaluate` correctly enforces the `security.allowEvaluate` guard, which is disabled by default. However, in the affected releases, `POST /wait` accepted a user-controlled `fn` expression, embedded it directly into executable JavaScript, and evaluated it in the browser context without checking the same policy. This is a security-policy bypass rather than a separate authentication bypass. Exploitation still requires authenticated API access, but a caller with the server token can execute arbitrary JavaScript in a tab context even when the operator explicitly disabled JavaScript evaluation. The current worktree fixes this by applying the same policy boundary to `fn` mode in `/wait` that already exists on `/evaluate`, while preserving the non-code wait modes. As of time of publication, a patched version is not yet available.",
    "evidence": "osv:CVE-2026-33622",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-33622",
      "aliases": [
        "CVE-2026-33622",
        "GHSA-w5pc-m664-r62v",
        "GO-2026-4824"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pinchtab/pinchtab",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e0c3e5748c1c3a1a0cab7790872bf0b3ec648bb4"
                },
                {
                  "last_affected": "ce7efa1c3d564cafcf094fcdbd22ffdd7863e71d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.8.3"
                      },
                      {
                        "last_affected": "0.8.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:pinchtab:pinchtab:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.8.3"
                      },
                      {
                        "last_affected": "0.8.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.8.5",
            "v0.8.4",
            "v0.8.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33622.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.173878597Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33622.json",
        "https://github.com/pinchtab/pinchtab/security/advisories/GHSA-w5pc-m664-r62v",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33622"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284",
          "CWE-693",
          "CWE-94"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33622.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33622",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 506652,
  "published_at": "2026-03-26T20:44:48.22+00:00"
}