Medium

Outline's Local File Storage Feature can Cause CSP Bypass

Type: advisorySources: OSV

Outline is a service that allows for collaborative documentation. In versions 0.72.0 through 0.83.0, Outline introduced a feature which facilitates local file system storage capabilities as an optional file storage strategy. This feature allowed a CSP bypass as well as a ContentType bypass that might facilitate further attacks. In the case of self-hosting and using Outline FILE_STORAGE=local on the same domain as the Outline application, a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions, allowing script execution within the context of another user. This is fixed in version 0.84.0.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2025-58351
Confirmed fixed CVEs: Not specified
Updated in this feed: 4 Nov 2026, 16:02 UTC · Revision 1

Source evidence

Outline's Local File Storage Feature can Cause CSP Bypass

core-osv · Original source

Published 3 Sept 2025, 03:20 UTC

osv:CVE-2025-58351

Complete source record

{
  "id": "37e1ba87ad271e1a7ca6221568b3f0caf44b500f36ecd7faf7a400946325d149",
  "url": "https://osv.dev/vulnerability/CVE-2025-58351",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Outline's Local File Storage Feature can Cause CSP Bypass",
    "summary": "Outline is a service that allows for collaborative documentation. In versions 0.72.0 through 0.83.0, Outline introduced a feature which facilitates local file system storage capabilities as an optional file storage strategy. This feature allowed a CSP bypass as well as a ContentType bypass that might facilitate further attacks. In the case of self-hosting and using Outline FILE_STORAGE=local on the same domain as the Outline application, a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions, allowing script execution within the context of another user. This is fixed in version 0.84.0.",
    "evidence": "osv:CVE-2025-58351",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-58351",
      "aliases": [
        "CVE-2025-58351",
        "GHSA-gcj7-c9jv-fhgf"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/outline/outline",
              "type": "GIT",
              "events": [
                {
                  "introduced": "56cae8a54563c0cd3b2dd28d64baa184a45c490f"
                },
                {
                  "fixed": "8ab0c6ff484f02b5d97e130b20376a17dd4546cc"
                },
                {
                  "fixed": "18bc93c9c207329244c6909606a2393e863892a3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:getoutline:outline:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.72.0"
                      },
                      {
                        "fixed": "0.84.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "18bc93c9c207329244c6909606a2393e863892a3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8ab0c6ff484f02b5d97e130b20376a17dd4546cc"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.84.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.82.0",
            "v0.80.2",
            "v0.80.1",
            "v0.80.0",
            "v0.79.1",
            "v0.79.0",
            "v0.78.0-0",
            "v0.77.1",
            "v0.77.0",
            "v0.76.2-0",
            "v0.76.1",
            "v0.76.0",
            "v0.76.0-2",
            "v0.76.0-1",
            "v0.76.0-0",
            "v0.75.2",
            "v0.75.1",
            "v0.75.0",
            "v0.73.1",
            "v0.73.0",
            "v0.72.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-58351.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.013967294Z",
      "provider": "osv",
      "references": [
        "https://github.com/outline/outline/releases/tag/v0.84.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/58xxx/CVE-2025-58351.json",
        "https://github.com/outline/outline/security/advisories/GHSA-gcj7-c9jv-fhgf",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-58351",
        "https://github.com/outline/outline/commit/18bc93c9c207329244c6909606a2393e863892a3"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/58xxx/CVE-2025-58351.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-58351",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504415,
  "published_at": "2025-09-03T03:20:54.579+00:00"
}