CVE-2021-20683 json
Cross-site Scripting (XSS) in baserCMS
published 2021-03-26 5 y ago modified 2026-09-10 1 mo ago also GHSA-v9w8-hq92-v39m , EUVD-2021-1408
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 54%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist baserproject/basercms 4.4.5
- basercms basercms 4.4.5
Exploit prediction
0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | baserproject/basercms | <4.4.5 |
4.4.5 |
Affected products
- baserCMS Users Community baserCMS
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
basercms.net
/security/JVN64869876
web, patch, vendor-advisory
-
github.com
/baserproject/basercms/commit/88ccc61e5656b05dd13204d61de706efaa2cd0b1
web
-
jvn.jp
/en/jp/JVN64869876/index.html
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-20683
advisory
Sources
- CVE List CVE-2021-20683
- GitHub Advisory GHSA-v9w8-hq92-v39m
- NVD CVE-2021-20683
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