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CRITICAL severity

OS Command Injection Vulnerability and Potential Zip Slip Vulnerability in baserCMSGHSA-7rpc-9m88-cf9w

CRITICALFix: baserproject/basercms@9088b99

GHSA-7rpc-9m88-cf9w is a critical-severity (CVSS 9.1) OS Command Injection vulnerability in baserproject/basercms. A fix is available for baserproject/basercms — see the affected versions and patch details below.

Also known asCVE-2021-41243
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 13, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk
1.67%2.21%2.76%3.30%2.8%2.2%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-7rpc-9m88-cf9w by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 386,684 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐘baserproject/basercms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

There is an OS Command Injection Vulnerability on the management system of baserCMS.

This is a vulnerability that needs to be addressed when the management system is used by an unspecified number of users. If you are eligible, please update to the new version as soon as possible.

Target baserCMS 4.5.3 and earlier versions

Vulnerability OS Command Injection Vulnerability.

Countermeasures Update to the latest version of baserCMS

Credits Akagi Yusuke @NTT-ME

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistbaserproject/basercmsall versions4.5.4composer require baserproject/basercms:^4.5.4

Affected Products

1 product · 1 configurations
Application
basercmsbasercms
< 4.5.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for baserproject/basercms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update baserproject/basercms to 4.5.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7rpc-9m88-cf9w is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

There is an OS Command Injection Vulnerability on the management system of baserCMS. This is a vulnerability that needs to be addressed when the management system is used by an unspecified number of users. If you are eligible, please update to the new version as soon as possible. Target baserCMS 4.5.3 and earlier versions Vulnerability OS Command Injection Vulnerability. Countermeasures Update to the latest version of baserCMS Credits Akagi Yusuke @NTT-ME
O3 Security · Impact-Aware SCA

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OS Command Injection Vulnerability and Potential Zip Slip…