CVE-2025-50183: @openlist frontend/openlist frontend Cross-Site Scripting Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2hw3-h8qx-hqqp",
  "modified" : "2025-06-19T15:19:19Z",
  "published" : "2025-06-18T14:41:25Z",
  "aliases" : [ "CVE-2025-50183" ],
  "summary" : "OpenList (frontend) allows XSS Attacks in the built-in Markdown Viewer",
  "details" : "XSS via `.py` file containing script tag interpreted as HTML\n\n## Summary\n\nA vulnerability exists in the file preview/browsing feature of the application, where files with a `.py` extension that contain JavaScript code wrapped in `<script>` tags may be interpreted and executed as HTML in certain modes. This leads to a stored XSS vulnerability.\n\n## Affected Versions\n\n* <= 4.0.0-rc.3\n\n## PoC\n\nCreate a `.py` file with arbitrary JavaScript content wrapped in `<script>` tags. For example:\n\n```javascript\n<script>alert(document.cookie);</script>\n```\n\nWhen a victim views the file in browsing mode (e.g., a rendered preview), the JavaScript is executed in the browser context.\n\n--- \n\n## Attack vector\n\nAn attacker can place such a `.py` file in the system via remote channels, such as:\n* Convincing a webmaster to download or upload the file; \n* Tricking users into accessing a file link via public URLs.\n\n## Required permissions\n\n* None, if public or visitor access is enabled.\n* If the file is uploaded by a user with elevated permissions, potential privilege boundaries may be crossed.\n\n## User interaction\n\nYes. The user must manually click to switch to the browsing or preview mode to trigger the script. And seems only when using `ISO-8859-1` encoding.\n\n## Scope\n\n* Unchanged `(S:U)` - The attack does not cross system or privilege boundaries in general.\n* ⚠️ Controversial edge case: If sensitive preview files are accessible due to misconfiguration, scope could be considered Changed `(S:C)`.\n\n## Impact\n\n* Confidentiality: User information including cookies, login state, and localStorage may be accessed. Some files that only can be viewed via this user will leak too.\n* Integrity & Availability: Not directly impacted.\n\n---\n\n## Recommendations\n\n* Treat all previewed file types (including non-HTML like .py) as plain text unless explicitly sanitized.\n* Disable rendering modes that can interpret user-uploaded content as HTML.\n\n## Timeline\n\n| Date | Event |\n|------|-------|\n| 2025-06-17 | Vulnerability reported |\n| 2025-06-17 | Comminuty Manager confirmed |\n| 2025-06-17 | Fixed |\n\n# Credits\n\n* Discovered by: @zyk2507\n* Reported to: [The OpenList Team](https://github.com/OpenListTeam)\n* Analyzed and confirmed by: @jyxjjj\n* Fixed by: @cxw620\n* Fixed in: `4.0.0-rc.4`",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@openlist-frontend/openlist-frontend"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.0.0-rc.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.0.0-rc.3"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/OpenListTeam/OpenList/security/advisories/GHSA-2hw3-h8qx-hqqp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-50183"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OpenListTeam/OpenList-Frontend/commit/7b5ed20c608c7b9b36d1950a386678e0a89f8175"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/OpenListTeam/OpenList"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-06-18T14:41:25Z",
    "nvd_published_at" : "2025-06-19T03:15:25Z"
  }
}