CVE-2026-30879
baserCMS: Cross-site scripting vulnerability in blog post
CVE-2026-30879 is a medium vulnerability (CVSS 6.9) in Basercms, published March 31, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 15th percentile. Fixed in baserproject/basercms 5.2.3.
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has a cross-site scripting vulnerability in blog posts. This issue has been patched in version 5.2.3.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
baserCMS: Cross-site scripting vulnerability in blog post
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has a cross-site scripting vulnerability in blog posts. This issue has been patched in version 5.2.3.
- Record
CVE-2026-30879- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2026-17263
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has a cross-site scripting vulnerability in blog posts. This issue has been patched in version 5.2.3.
- Record
EUVD-2026-17263- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-jmq3-x8q7-j9qm
baserCMS has a cross-site scripting vulnerability in blog posts
baserCMS has a cross-site scripting vulnerability in blog posts.
Target
baserCMS 5.2.1 and earlier versions
Vulnerability
Malicious Javascript may be executed in blog posts.
Countermeasures
Update to the latest version of baserCMS
Please refer to the following page to reference for more information. https://basercms.net/security/JVN_20837860
Credits
Gai Tanaka@Mitsui Bussan Secure Directions, Inc.
- Record
GHSA-jmq3-x8q7-j9qm- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has a cross-site scripting vulnerability in blog posts. This issue has been patched in version 5.2.3.
- Record
CVE-2026-30879- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
baserCMS: Cross-site scripting vulnerability in blog post
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has a cross-site scripting vulnerability in blog posts. This issue has been patched in version 5.2.3.
- Record
CVE-2026-30879- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVGHSA-jmq3-x8q7-j9qm
baserCMS has a cross-site scripting vulnerability in blog posts
baserCMS has a cross-site scripting vulnerability in blog posts.
Target
baserCMS 5.2.1 and earlier versions
Vulnerability
Malicious Javascript may be executed in blog posts.
Countermeasures
Update to the latest version of baserCMS
Please refer to the following page to reference for more information. https://basercms.net/security/JVN_20837860
Credits
Gai Tanaka@Mitsui Bussan Secure Directions, Inc.
- Record
GHSA-jmq3-x8q7-j9qm- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
baserproject/basercmsPackagist |
through 5.2.2 | 5.2.3 |
baserproject/basercmsPackagist |
before 5.2.3, 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 |
5.2.3 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-02 | created | CVE List, EUVD, GitHub Advisories, NVD, OSV |
References
github.com/baserproject/basercms/security/advisories/GHSA-jmq3-x8q7-j9qm
basercms.net/security/JVN_20837860
nvd.nist.gov/vuln/detail/CVE-2026-30879
Left out here: 105 versions. The JSON record has them.