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Baserow before 2.3.1 Unauthenticated Data Disclosure via Discarded Permission Check on Builder Data Sources

Type: advisorySources: OSV

Baserow dispatches an Application Builder data source without acting on the result of its permission check. The dispatch and record-name views in backend/src/baserow/contrib/builder/api/data_sources/views.py are declared with a permission class that admits any caller, so a request carrying no credential reaches the handler. DataSourceService.dispatch_data_sources in backend/src/baserow/contrib/builder/data_sources/service.py then calls check_multiple_permissions without asking it to raise, and neither stores nor examines the mapping of denials it returns, so a denied check leaves execution to continue and the data source is dispatched whatever the caller's identity. The dispatch runs with the integration's own credentials, so an unauthenticated request naming a data source receives the rows and fields that source reads. Identifiers are small integers and can be enumerated. Version 2.3.1 passes raise_exception to the same call.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-81335
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 02:51 UTC · Revision 1

Source evidence

Baserow before 2.3.1 Unauthenticated Data Disclosure via Discarded Permission Check on Builder Data Sources

core-osv · Original source

Published 27 Aug 2026, 14:50 UTC

Baserow dispatches an Application Builder data source without acting on the result of its permission check. The dispatch and record-name views in backend/src/baserow/contrib/builder/api/data_sources/views.py are declared with a permission class that admits any caller, so a request carrying no credential reaches the handler. DataSourceService.dispatch_data_sources in backend/src/baserow/contrib/builder/data_sources/service.py then calls check_multiple_permissions without asking it to raise, and neither stores nor examines the mapping of denials it returns, so a denied check leaves execution to continue and the data source is dispatched whatever the caller's identity. The dispatch runs with the integration's own credentials, so an unauthenticated request naming a data source receives the rows and fields that source reads. Identifiers are small integers and can be enumerated. Version 2.3.1 passes raise_exception to the same call.

osv:CVE-2026-81335
Complete source record
{
  "id": "f294bd1197d45d903da5a6b798fb8aeadcfddb4bd95ebdfca5fc51122062598d",
  "url": "https://osv.dev/vulnerability/CVE-2026-81335",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Baserow before 2.3.1 Unauthenticated Data Disclosure via Discarded Permission Check on Builder Data Sources",
    "summary": "Baserow dispatches an Application Builder data source without acting on the result of its permission check. The dispatch and record-name views in backend/src/baserow/contrib/builder/api/data_sources/views.py are declared with a permission class that admits any caller, so a request carrying no credential reaches the handler. DataSourceService.dispatch_data_sources in backend/src/baserow/contrib/builder/data_sources/service.py then calls check_multiple_permissions without asking it to raise, and neither stores nor examines the mapping of denials it returns, so a denied check leaves execution to continue and the data source is dispatched whatever the caller's identity. The dispatch runs with the integration's own credentials, so an unauthenticated request naming a data source receives the rows and fields that source reads. Identifiers are small integers and can be enumerated. Version 2.3.1 passes raise_exception to the same call.",
    "evidence": "osv:CVE-2026-81335",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-81335",
      "aliases": [
        "CVE-2026-81335"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/baserow/baserow",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "42fec420b6d0266a77e1403036ade3b9a7a3f446"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.3.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.3.0",
            "2.2.2",
            "2.2.1",
            "2.2.0",
            "2.1.6",
            "2.1.4",
            "2.1.3",
            "2.1.2",
            "2.1.1",
            "2.0.6",
            "2.0.5",
            "2.0.4",
            "2.0.3",
            "2.0.2",
            "2.0.1",
            "2.0.0",
            "1.35.3",
            "1.35.2",
            "1.35.1",
            "1.35.0",
            "1.34.5",
            "1.34.4",
            "1.34.3",
            "1.34.2",
            "1.34.1",
            "1.34.0",
            "1.33.4",
            "1.33.3",
            "1.33.2",
            "1.33.1",
            "1.33.0",
            "1.32.5",
            "1.32.4",
            "1.32.3",
            "1.32.2",
            "1.32.1",
            "1.32.0",
            "1.31.1",
            "1.31.0",
            "1.30.1",
            "1.30.0",
            "1.29.3",
            "1.29.2",
            "1.29.1",
            "1.29.0",
            "1.28.0",
            "1.27.2",
            "1.27.1",
            "1.27.0",
            "1.26.1",
            "1.26.0",
            "1.25.2",
            "1.25.1",
            "1.25.0",
            "1.24.2",
            "1.24.1",
            "1.24.0",
            "1.23.2",
            "1.23.1",
            "1.23.0",
            "1.22.3",
            "1.22.2",
            "1.22.1",
            "1.22.0",
            "1.21.2",
            "1.21.1",
            "1.21.0",
            "1.20.2",
            "1.20.1",
            "1.20.0",
            "1.19.1",
            "1.19.0",
            "1.18.0",
            "1.17.2",
            "1.17.1",
            "1.17.0",
            "1.16.1-rc1",
            "1.16.0",
            "1.15.2",
            "1.15.1",
            "1.15.0",
            "1.14.0",
            "1.13.3",
            "1.13.2",
            "1.13.1",
            "1.13.0",
            "1.12.1",
            "1.12.0",
            "1.11.0",
            "1.10.2",
            "1.10.1",
            "1.10.0",
            "1.9.1",
            "1.9",
            "1.8.3",
            "1.8.2",
            "1.8.1",
            "1.8.0",
            "1.7.1",
            "1.7.0",
            "1.6.0",
            "1.5.0",
            "1.4.3",
            "1.4.2",
            "1.4.1",
            "1.4.0",
            "1.3.0",
            "1.2.0",
            "1.1.0",
            "1.0.1",
            "1.0.0",
            "0.8.0",
            "0.7.1",
            "0.7.0",
            "0.6.0",
            "0.5.0",
            "0.4.0",
            "0.3.1",
            "0.3.0",
            "0.2.0",
            "0.1.0",
            "0.0.2",
            "0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81335.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.295724562Z",
      "provider": "osv",
      "references": [
        "https://baserow.io",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81335.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81335",
        "https://www.vulncheck.com/advisories/baserow-before-2.3.1-unauthenticated-data-disclosure-via-discarded-permission-check-on-builder-data-sources",
        "https://github.com/bram2w/baserow/blob/2.3.1/backend/src/baserow/contrib/builder/data_sources/service.py",
        "https://github.com/bram2w/baserow",
        "https://github.com/bram2w/baserow/blob/2.3.0/backend/src/baserow/contrib/builder/data_sources/service.py"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81335.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-81335",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517514,
  "published_at": "2026-08-27T14:50:42.684+00:00"
}