CVE-2026-27948: Copyparty is a portable file server

Q: How do I fix CVE-2026-27948?

copyparty: upgrade to 1.20.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-27948 being exploited?

CVE-2026-27948 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-2026-27948 affect?

CVE-2026-27948 affects copyparty. Severity is medium (CVSS 5.4). Copyparty is a portable file server. In versions prior to 1.20.9, an XSS allows for reflected cross-site scripting via URL-parameter `?setck=...`. Version 1.20.9 fixes the issue.

Q: How urgent is CVE-2026-27948?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-27948 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 prior to 1.20.9, an XSS allows for reflected cross-site scripting via URL-parameter `?setck=...`. Version 1.20.9 fixes the issue.

Why this priority

No elevated risk signals yet

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	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-02-26
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

2026-02-26 02:16 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

9001 copyparty UPGRADE

Affected: < 1.20.9

Fixed in: 1.20.9

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.20.9 (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-2026-27948?

copyparty: upgrade to 1.20.9. Exact commands for each OS are on this page.

Is CVE-2026-27948 being exploited?

CVE-2026-27948 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-2026-27948 affect?

CVE-2026-27948 affects copyparty. Severity is medium (CVSS 5.4). Copyparty is a portable file server. In versions prior to 1.20.9, an XSS allows for reflected cross-site scripting via URL-parameter `?setck=...`. Version 1.20.9 fixes the issue.

How urgent is CVE-2026-27948?

Priority 21/100. No elevated risk signals yet.

Related CVEs

CVE-2026-30974 MEDIUM 4.6 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
CVE-2025-54423 MEDIUM 5.4 UPGRADE copyparty is a portable file server

References

← Back to latest CVEs