{"cve":"CVE-2026-32109","nvd":{"published":"2026-03-11T21:16:16.913","modified":"2026-06-17T10:35:09.143","status":"Analyzed","description":"Copyparty is a portable file server. Prior to 1.20.12, if an attacker has been given both read- and write-permissions to the server, they can upload a malicious file with the filename .prologue.html and then craft a link to potentially execute arbitrary JavaScript in the victim's context. Note that it is intended behavior that the JavaScript would execute if the target clicks a link to the HTML file itself; \"https://example.com/foo/.prologue.html\". The vulnerability is that \"https://example.com/foo/?b\" would also evaluate the file, making the behavior unexpected. There are existing preventative measures (strict SameSite cookies) which makes it harder to leverage this vulnerability in an attack; in order to gain control of the target's authenticated session, the link must be clicked from a page served by the server itself -- most likely by editing an existing resource, which would require additional access permissions. Finally, for this attack to be successful, the attacker's target must click the specific crafted link given by the attacker. This vulnerability is not activated by normally browsing the web-UI on the server. This vulnerability is fixed in 1.20.12.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N","score":4.4},"cwes":["CWE-79"],"references":["https://github.com/9001/copyparty/security/advisories/GHSA-rcp6-88mm-9vgf"],"products":["9001:copyparty"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-32109","score":0.00172,"percentile":0.0655,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-rcp6-88mm-9vgf","url":"https://osv.dev/vulnerability/GHSA-rcp6-88mm-9vgf","summary":"Copyparty has unexpected JavaScript execution via crafted URL to folder with `.prologue.html`","modified":"2026-06-05T18:00:13.902163811Z","packages":[{"ecosystem":"PyPI","name":"copyparty","purl":"pkg:pypi/copyparty","ranges":["<1.20.12"],"fixed":["1.20.12"]}]},{"id":"PYSEC-2026-32","url":"https://osv.dev/vulnerability/PYSEC-2026-32","summary":"","modified":"2026-05-20T09:18:55.554878Z","packages":[{"ecosystem":"PyPI","name":"copyparty","purl":"pkg:pypi/copyparty","ranges":["<1.20.12"],"fixed":["1.20.12"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}