CVE-2021-43742 json
CMSimple 5.4 is vulnerable to Cross Site Scripting (XSS) via the file upload feature.
published 2022-04-13 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-30649
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 47%
- public exploits
- 0
- none known
Summary
CMSimple 5.4 is vulnerable to Cross Site Scripting (XSS) via the file upload feature.
Exploit prediction
0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/iiSiLvEr/CVEs/tree/main/CVE-2021-43742 referenced PoC, tagged "exploit" by a source, unverified
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 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/iiSiLvEr/CVEs/tree/main/CVE-2021-43742
exploit, third-party-advisory
-
github.com
/iiSiLvEr/CMSimple5.4-Vulnerabilities
broken-link
Sources
- CVE List CVE-2021-43742
- NVD CVE-2021-43742
Fencer Vulns 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.