CVE-2021-41243
OS Command Injection Vulnerability and Potential Zip Slip Vulnerability
There is a Potential Zip Slip Vulnerability and OS Command Injection Vulnerability on the management system of baserCMS. Users with permissions to upload files may upload crafted zip files which may execute arbitrary commands on the host operating system. 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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
OS Command Injection Vulnerability and Potential Zip Slip Vulnerability
There is a Potential Zip Slip Vulnerability and OS Command Injection Vulnerability on the management system of baserCMS. Users with permissions to upload files may upload crafted zip files which may execute arbitrary commands on the host operating system. 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.
- Record
CVE-2021-41243- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L - Weakness
- CWE-78
- Updated
- 2026-11-02
EUVDEUVD-2021-2476
There is a Potential Zip Slip Vulnerability and OS Command Injection Vulnerability on the management system of baserCMS. Users with permissions to upload files may upload crafted zip files which may execute arbitrary commands on the host operating system. 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.
- Record
EUVD-2021-2476- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7rpc-9m88-cf9w
OS Command Injection Vulnerability and Potential Zip Slip Vulnerability in baserCMS
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
- Record
GHSA-7rpc-9m88-cf9w- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L - Weakness
- CWE-78
- Updated
- 2026-11-02
NVD
There is a Potential Zip Slip Vulnerability and OS Command Injection Vulnerability on the management system of baserCMS. Users with permissions to upload files may upload crafted zip files which may execute arbitrary commands on the host operating system. 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.
- Record
CVE-2021-41243- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 9.0 High
AV:N/AC:L/Au:S/C:C/I:C/A:C - Weakness
- CWE-78
- Updated
- 2026-11-02
OSV
There is a Potential Zip Slip Vulnerability and OS Command Injection Vulnerability on the management system of baserCMS. Users with permissions to upload files may upload crafted zip files which may execute arbitrary commands on the host operating system. 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.
- Record
CVE-2021-41243- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-7rpc-9m88-cf9w
OS Command Injection Vulnerability and Potential Zip Slip Vulnerability in baserCMS
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
- Record
GHSA-7rpc-9m88-cf9w- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L - Weakness
- CWE-78
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
baserproject/basercmsPackagist |
before 4.5.4 | 4.5.4 |
baserproject/basercmsPackagist |
before 4.5.4, plus listed versions 0.0.10.0.20.0.30.0.40.0.5 Show 45 moreShow less0.0.60.0.70.0.81.0.02.0.0-rc12.0.0-rc22.0.0-rc32.0.0-rc42.0.0-rc52.0.0-rc63.0.103.0.10.13.0.113.0.11.13.0.123.0.133.0.143.0.153.0.163.0.173.0.183.0.193.0.203.0.213.0.223.0.233.0.243.0.253.0.263.0.73.0.7.13.0.83.0.8.13.0.93.0.9.14.0.04.0.0-beta4.0.14.0.104.0.10.14.0.114.0.24.0.2.14.0.34.0.4 |
4.5.4 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-41243 is a critical vulnerability (CVSS 9.1) in Basercms, published November 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.17%, the 82nd percentile. Fixed in baserproject/basercms 4.5.4.
References
Left out here: 47 versions. The JSON record has them.