CVE-2023-25305: PolyMC Launcher <= 1.4.3 is vulnerable to Directory Traversal

Q: How do I fix CVE-2023-25305?

polymc: upgrade to 5.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-25305 being exploited?

CVE-2023-25305 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-2023-25305 affect?

CVE-2023-25305 affects polymc. Severity is high (CVSS 7.1). PolyMC Launcher <= 1.4.3 is vulnerable to Directory Traversal. A mrpack file can be maliciously crafted to create arbitrary files outside of the installation directory.

Q: How urgent is CVE-2023-25305?

Priority 41/100. High severity; Public exploit reference

This month

HIGH 7.1UPGRADE

CVE-2023-25305 is a high-severity flaw (CVSS 7.1) affecting polymc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PolyMC Launcher <= 1.4.3 is vulnerable to Directory Traversal. A mrpack file can be maliciously crafted to create arbitrary files outside of the installation directory.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-22
Published	2023-04-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: polymc

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

Am I affected?

Timeline

2023-04-04 13:15 UTCPublished CVE record published
2026-06-17 05:41 UTCUpdated Record last modified

polymc polymc UPGRADE

Affected: < 5.0

Fixed in: 5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 5.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade polymc

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-2023-25305?

polymc: upgrade to 5.0. Exact commands for each OS are on this page.

Is CVE-2023-25305 being exploited?

CVE-2023-25305 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-2023-25305 affect?

CVE-2023-25305 affects polymc. Severity is high (CVSS 7.1). PolyMC Launcher <= 1.4.3 is vulnerable to Directory Traversal. A mrpack file can be maliciously crafted to create arbitrary files outside of the installation directory.

How urgent is CVE-2023-25305?

Priority 41/100. High severity; Public exploit reference

References

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