CVE-2021-42656 json
Cross site scripting in SiteServer CMS
published 2022-05-24 4 y ago modified 2026-06-17 4 mo ago also GHSA-2xwp-7j3p-c78x , EUVD-2022-2075
- 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 53%
- public exploits
- 0
- none known
Summary
SiteServer CMS V6.15.51 is affected by a Cross Site Scripting (XSS) vulnerability.
Patch / fix
Exploit prediction
0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/siteserver/cms/issues/3238 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 |
| 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 |
|---|---|---|---|
| nuget | SSCMS | <=6.15.51 |
no fix listed |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/siteserver/cms/releases/download/siteserver-v6.15.51/siteserver_install.zip
patch, third-party-advisory
-
github.com
/siteserver/cms/issues/3238
web, exploit, issue-tracking, third-party-advisory
-
github.com
/siteserver/cms
package, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-42656
advisory
Sources
- CVE List CVE-2021-42656
- GitHub Advisory GHSA-2xwp-7j3p-c78x
- NVD CVE-2021-42656
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