{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.74.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rclone/rclone"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.75.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-319",
      "CWE-522"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-05T20:36:10Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## 1. Summary\n\nWebDAV\u0027s default redirect handling can replay Basic authorization and configured Cookie headers over plaintext HTTP after a same-host HTTPS-to-HTTP redirect. This was reproduced through the real backend. Unlike the low-impact STS token in rclone\u0027s published S3 redirect advisory, Basic passwords and session cookies are complete reusable credentials, supporting a High rating when they grant normal WebDAV read/write access.\n\nThe credible threat requires a legitimate endpoint, gateway, or accelerator to emit an unsafe redirect and an adjacent/on-path actor to observe the plaintext hop. A report should not rely on a malicious original WebDAV endpoint because that endpoint already receives the credentials.\n\n## 2. Affected Assets \u0026 Attack Surface\n\n- Backend configuration/authentication: `backend/webdav/webdav.go:127-139`, `170-206`, `440-530`\n- Shared redirect callback: `lib/rest/rest.go:218-231`\n- HTTP client: `fs/fshttp/http.go:311-329`\n- Credentials: Basic passwords, bearer authorization, SharePoint/session cookies, and configured secret headers\n- Confirmed affected version: `\u003c= v1.74.0-240`\n\n## 3. Technical Root Cause Analysis\n\n`PreserveMethodRedirectFn` limits redirect count and restores the original method, but it does not reject a transport downgrade or compare the full origin tuple. The client therefore relies on Go\u0027s hostname-oriented sensitive-header forwarding rules. Those rules can preserve `Authorization` and Cookie on a same-host redirect even when the new scheme is plaintext HTTP.\n\n## 4. Proof-of-Concept \u0026 Evidence\n\n1. Configure the actual WebDAV backend with Basic credentials and a Cookie.\n2. Have the TLS endpoint return `307 Temporary Redirect` to an HTTP listener on the same hostname and a different port.\n3. rclone follows the redirect while preserving the WebDAV method.\n4. The plaintext listener receives both the Basic `Authorization` value and Cookie.\n\n## 5. Impact Assessment\n\nAn on-path observer can reuse the captured password, bearer token, or session cookie for the account\u0027s permitted WebDAV operations. Confidentiality, integrity, and availability impact depend on that account\u0027s permissions.\n\n## 6. Remediation Guidance\n\n- Reject every HTTPS-to-HTTP redirect before replay.\n- Forward authenticated requests by default only when scheme, hostname, and effective port are unchanged.\n- Strip authorization, cookies, proxy credentials, and configured secret headers on all other redirects.\n- Put necessary provider exceptions behind exact destination allowlists.\n- Cover `301`, `302`, `303`, `307`, and `308` in regression tests.",
  "id": "GHSA-h4mf-4v27-hggj",
  "modified": "2026-08-05T20:36:10Z",
  "published": "2026-08-05T20:36:10Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/security/advisories/GHSA-h4mf-4v27-hggj"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/commit/59b513b0e74fd2943ccbb8891d5ce00f860e6d26"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rclone/rclone"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rclone/rclone/releases/tag/v1.75.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rclone: WebDAV Credentials Survive a Same-Host HTTPS-to-HTTP Redirect"
}