Medium severity · published Jan 21, 2026
CVE-2021-47860
GetSimple CMS Custom JS 0.1 - CSRF to XSS to RCE
4.3
CVSS
0.3%
EPSS
No
On KEV
Description
GetSimple CMS Custom JS 0.1 plugin contains a cross-site request forgery vulnerability that allows unauthenticated attackers to inject arbitrary client-side code into administrator browsers. Attackers can craft a malicious website that triggers a cross-site scripting payload to execute remote code on the hosting server when an authenticated administrator visits the page.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CJ
Custom JS Plugin · GetSimple CMS
0.1 · source: vendor
GE
Getsimplecms · Get-simple
0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47860
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-47860
Product
http://get-simple.info
Product
https://github.com/GetSimpleCMS/GetSimpleCMS
Exploit
https://github.com/boku7/gsCMS-CustomJS-Csrf2Xss2Rce
Exploit
https://www.exploit-db.com/exploits/49712
Exploit
https://www.exploit-db.com/exploits/49816
Third Party Advisory
https://www.vulncheck.com/advisories/getsimple-cms-custom-js-csrf-to-xss-to-rce