CVE-2025-54423: copyparty is a portable file server

Q: How do I fix CVE-2025-54423?

copyparty: upgrade to 1.18.5. Exact commands for each OS are on this page.

Q: Is CVE-2025-54423 being exploited?

CVE-2025-54423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-54423 affect?

CVE-2025-54423 affects copyparty. Severity is medium (CVSS 5.4). 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 fi

Q: How urgent is CVE-2025-54423?

Priority 34/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2025-54423 is a medium-severity flaw (CVSS 5.4) affecting copyparty. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-07-28
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: 9001

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-07-28 20:17 UTCPublished CVE record published
2026-06-17 09:40 UTCUpdated Record last modified

9001 copyparty UPGRADE

Affected: < 1.18.5

Fixed in: 1.18.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy copyparty || rpm -q copyparty || copyparty --version

2. UPGRADE to 1.18.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade copyparty

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade copyparty

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-54423?

copyparty: upgrade to 1.18.5. Exact commands for each OS are on this page.

Is CVE-2025-54423 being exploited?

CVE-2025-54423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-54423 affect?

CVE-2025-54423 affects copyparty. Severity is medium (CVSS 5.4). 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 fi

How urgent is CVE-2025-54423?

Priority 34/100. Public exploit reference

Related CVEs

CVE-2026-30974 MEDIUM 4.6 UPGRADE Copyparty is a portable file server
CVE-2026-27948 MEDIUM 5.4 UPGRADE Copyparty is a portable file server
CVE-2025-58753 HIGH 7.5 UPGRADE Copyparty is a portable file server
CVE-2025-54796 HIGH 7.5 UPGRADE Copyparty is a portable file server
CVE-2025-54589 MEDIUM 6.3 UPGRADE Copyparty is a portable file server

References

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