CVE-2021-41279
Zip Slip Vulnerability in BaserCMS
CVE-2021-41279 is a high vulnerability (CVSS 7.7) in Basercms, published November 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.62%, the 76th percentile. Fixed in baserproject/basercms 4.5.4.
BaserCMS is an open source content management system with a focus on Japanese language support. In affected versions users with upload privilege may upload crafted zip files capable of path traversal 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
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Zip Slip Vulnerability in BaserCMS
BaserCMS is an open source content management system with a focus on Japanese language support. In affected versions users with upload privilege may upload crafted zip files capable of path traversal 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-2021-41279- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
EUVDEUVD-2021-2442
BaserCMS is an open source content management system with a focus on Japanese language support. In affected versions users with upload privilege may upload crafted zip files capable of path traversal 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-2021-2442- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-4x2f-54wr-4hjg
Potential Zip Slip Vulnerability in baserCMS
There is a 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 Daniele Scanu @SoterItSecurity
- Record
GHSA-4x2f-54wr-4hjg- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
NVD
BaserCMS is an open source content management system with a focus on Japanese language support. In affected versions users with upload privilege may upload crafted zip files capable of path traversal 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-2021-41279- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - 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-22
- Updated
- 2026-11-02
OSV
BaserCMS is an open source content management system with a focus on Japanese language support. In affected versions users with upload privilege may upload crafted zip files capable of path traversal 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-2021-41279- 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-4x2f-54wr-4hjg
Potential Zip Slip Vulnerability in baserCMS
There is a 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 Daniele Scanu @SoterItSecurity
- Record
GHSA-4x2f-54wr-4hjg- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-22
- 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
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |
References
Left out here: 47 versions. The JSON record has them.