CVE-2021-20683
Cross-site Scripting (XSS) in baserCMS
Improper neutralization of JavaScript input in the blog article editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
Improper neutralization of JavaScript input in the blog article editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.
- Record
CVE-2021-20683- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
Improper neutralization of JavaScript input in the blog article editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.
- Record
CVE-2021-20683- Updated
- 2026-11-02
EUVDEUVD-2021-1408 No score
Improper neutralization of JavaScript input in the blog article editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.
- Record
EUVD-2021-1408- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-v9w8-hq92-v39m
Cross-site Scripting (XSS) in baserCMS
Improper neutralization of JavaScript input in the blog article editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.
- Record
GHSA-v9w8-hq92-v39m- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
Improper neutralization of JavaScript input in the blog article editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.
- Record
CVE-2021-20683- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-v9w8-hq92-v39m
Cross-site Scripting (XSS) in baserCMS
Improper neutralization of JavaScript input in the blog article editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.
- Record
GHSA-v9w8-hq92-v39m- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
baserproject/basercmsPackagist |
before 4.4.5 | 4.4.5 |
baserproject/basercmsPackagist |
before 4.4.5, 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 |
4.4.5 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-20683 is a medium vulnerability (CVSS 5.4) in Basercms, published March 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.73%, the 54th percentile. Fixed in baserproject/basercms 4.4.5.
References
Left out here: 39 versions. The JSON record has them.