CVE-2023-53889: Perch CMS 3.2 contains a remote code execution vulnerability that allows authenticated administrators to uploa

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HIGH 7.2DOWNGRADE

CVE-2023-53889 is a high-severity flaw (CVSS 7.2) affecting perch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Perch CMS 3.2 contains a remote code execution vulnerability that allows authenticated administrators to upload arbitrary PHP files through the assets management interface. Attackers can upload a malicious .phar file with embedded system command execution capabilities to execute arbitrary commands on the server.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-12-15
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: grabaperch

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

Am I affected?

Timeline

2025-12-15 21:15 UTCPublished CVE record published
2026-06-17 06:46 UTCUpdated Record last modified

grabaperch perch DOWNGRADE

Affected: 3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.2 (Debian / Ubuntu)

apt-cache madison perch sudo apt install perch=<VERSION_BEFORE_3.2> sudo apt-mark hold perch

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list perch sudo dnf downgrade perch-<VERSION_BEFORE_3.2> sudo dnf versionlock add perch

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-53889?

perch: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-53889 being exploited?

CVE-2023-53889 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-2023-53889 affect?

CVE-2023-53889 affects perch. Severity is high (CVSS 7.2). Perch CMS 3.2 contains a remote code execution vulnerability that allows authenticated administrators to upload arbitrary PHP files through the assets management interface. Attackers can upload a malicious .phar file with embedded system co

How urgent is CVE-2023-53889?

Priority 45/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-66686 MEDIUM 6.1 DOWNGRADE A stored Cross-Site Scripting (XSS) vulnerability exists in Perch CMS version 3.2
CVE-2023-53890 MEDIUM 5.4 DOWNGRADE Perch CMS 3.2 contains a stored cross-site scripting vulnerability that allows authenticated users to upload m

References

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