CVE-2025-54423 json
copyparty has a DOM-Based XSS vulnerability when displaying multimedia metadata
published last yr. modified 4mo ago also EUVD-2025-22945 , GHSA-9q4r-x2hj-jmvr , PYSEC-2026-1277
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi copyparty 1.18.5
- 9001 copyparty 1.18.5
- copyparty_project copyparty 1.18.5
Is CVE-2025-54423 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- github.com https://github.com/9001/copyparty/security/advisories/GHSA-9q4r-x2hj-jmvr referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | copyparty | <1.18.5 |
1.18.5 |
Affected products
- 9001 copyparty
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/9001/copyparty/commit/895880aeb0be0813ddf732487596633f8f9fc3a6
web, patch
-
github.com
/9001/copyparty/security/advisories/GHSA-9q4r-x2hj-jmvr
web, exploit, vendor-advisory
-
github.com
/9001/copyparty/releases/tag/v1.18.5
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2025-54423
advisory
-
github.com
/9001/copyparty
package
-
pypi.org
/project/copyparty
package
-
github.com
/advisories/GHSA-9q4r-x2hj-jmvr
advisory
Sources
- CVE List CVE-2025-54423
- GitHub Advisory GHSA-9q4r-x2hj-jmvr
- NVD CVE-2025-54423
- OSV PYSEC-2026-1277
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.