CVE-2021-46360: Authenticated remote code execution (RCE) in Composr-CMS 10.0.39 and earlier allows remote attackers to execut

Q: How do I fix CVE-2021-46360?

composr: upgrade to newer than 10.0.39. Exact commands for each OS are on this page.

Q: Is CVE-2021-46360 being exploited?

CVE-2021-46360 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-2021-46360 affect?

CVE-2021-46360 affects composr. Severity is high (CVSS 8.8). Authenticated remote code execution (RCE) in Composr-CMS 10.0.39 and earlier allows remote attackers to execute arbitrary code via uploading a PHP shell through /adminzone/index.php?page=admin-commandr.

Q: How urgent is CVE-2021-46360?

Priority 60/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

This week

HIGH 8.8UPGRADE

CVE-2021-46360 is a high-severity flaw (CVSS 8.8) affecting composr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authenticated remote code execution (RCE) in Composr-CMS 10.0.39 and earlier allows remote attackers to execute arbitrary code via uploading a PHP shell through /adminzone/index.php?page=admin-commandr.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	9.2% (top 5%)
CISA exploited list	No
Weakness	CWE-434
Published	2022-02-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ocproducts

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

Am I affected?

Timeline

2022-02-09 14:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

ocproducts composr UPGRADE

Affected: <= 10.0.39

Fixed in: newer than 10.0.39

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 10.0.39 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade composr

Note

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

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Composr-CMS Version <=10.0.39 - Authenticated Remote Code Execution

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-2021-46360?

composr: upgrade to newer than 10.0.39. Exact commands for each OS are on this page.

Is CVE-2021-46360 being exploited?

CVE-2021-46360 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-2021-46360 affect?

CVE-2021-46360 affects composr. Severity is high (CVSS 8.8). Authenticated remote code execution (RCE) in Composr-CMS 10.0.39 and earlier allows remote attackers to execute arbitrary code via uploading a PHP shell through /adminzone/index.php?page=admin-commandr.

How urgent is CVE-2021-46360?

Priority 60/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-30150 MEDIUM 6.1 DOWNGRADE Composr 10.0.36 allows XSS in an XML script.
CVE-2021-30149 CRITICAL 9.8 DOWNGRADE Composr 10.0.36 allows upload and execution of PHP files.

References

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