CVE-2021-20681 json
Cross-site Scripting (XSS) in baserCMS
published 5y ago modified last mo. also GHSA-24p5-x9f9-vvpx , EUVD-2021-1236
- 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 page 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
- basercms.net/security/JVN64869876 advisory
Is CVE-2021-20681 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-09).
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
-
jvn.jp
/en/jp/JVN64869876/index.html
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-20681
advisory
Sources
- CVE List CVE-2021-20681
- GitHub Advisory GHSA-24p5-x9f9-vvpx
- NVD CVE-2021-20681
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.