Description

copyparty, a portable file server, has a DOM-based cross-site scripting vulnerability in versions prior to 1.16.15. The vulnerability is considered low-risk. By handing someone a maliciously-named file, and then tricking them into dragging the file into copyparty's Web-UI, an attacker could execute arbitrary javascript with the same privileges as that user. For example, this could give unintended read-access to files owned by that user. The bug is triggered by the drag-drop action itself; it is not necessary to actually initiate the upload. The file must be empty (zero bytes). Note that, as a general-purpose webserver, it is intentionally possible to upload HTML-files with arbitrary javascript in `` tags, which will execute when the file is opened. The difference is that this vulnerability would trigger execution of javascript during the act of uploading, and not when the uploaded file was opened. Version 1.16.15 contains a fix.

Classification

CVE ID: CVE-2025-27145

CVSS Base Severity: LOW

CVSS Base Score: 3.6

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected Products

Vendor: 9001

Product: copyparty

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 11.9% (scored less or equal to compared to others)

EPSS Date: 2025-03-25 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-27145
https://github.com/9001/copyparty/security/advisories/GHSA-m2jw-cj8v-937r
https://github.com/9001/copyparty/commit/438ea6ccb06f39d7cbb4b6ee7ad44606e21a63dd
https://github.com/9001/copyparty/releases/tag/v1.16.15

Timeline