CVE-2021-42656
Cross site scripting in SiteServer CMS
SiteServer CMS V6.15.51 is affected by a Cross Site Scripting (XSS) vulnerability.
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
SiteServer CMS V6.15.51 is affected by a Cross Site Scripting (XSS) vulnerability.
- Record
CVE-2021-42656- 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
SiteServer CMS V6.15.51 is affected by a Cross Site Scripting (XSS) vulnerability.
- Record
CVE-2021-42656- Updated
- 2026-11-02
EUVDEUVD-2022-2075 No score
SiteServer CMS V6.15.51 is affected by a Cross Site Scripting (XSS) vulnerability.
- Record
EUVD-2022-2075- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2xwp-7j3p-c78x
Cross site scripting in SiteServer CMS
SiteServer CMS V6.15.51 is affected by a Cross Site Scripting (XSS) vulnerability.
- Record
GHSA-2xwp-7j3p-c78x- 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
SiteServer CMS V6.15.51 is affected by a Cross Site Scripting (XSS) vulnerability.
- Record
CVE-2021-42656- 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-2xwp-7j3p-c78x
Cross site scripting in SiteServer CMS
SiteServer CMS V6.15.51 is affected by a Cross Site Scripting (XSS) vulnerability.
- Record
GHSA-2xwp-7j3p-c78x- 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
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-42656 is a medium vulnerability (CVSS 5.4) in Sscms Siteserver Cms, published May 24, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.71%, the 53rd percentile. No source names a fixed version.