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CVE-2021-47870

GetSimple CMS My SMTP Contact Plugin 1.1.2 - Stored XSS

Published: Jan 21, 2026Updated: May 12, 2026 Sources: CVE List NVDCWE-79
5.4MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 85.5%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
No Fix Available
Self-Check
Not available

Description

GetSimple CMS My SMTP Contact Plugin 1.1.2 suffers from a Stored Cross-Site Scripting (XSS) vulnerability. The plugin attempts to sanitize user input using htmlspecialchars(), but this can be bypassed by passing dangerous characters as escaped hex bytes. This allows attackers to inject arbitrary client-side code that executes in the administrator's browser when visiting a malicious page.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

GetSimple CMS
oss-project
My SMTP Contact PluginOn-prem
Web & CMS Plugins / cms-core
get-simple
commercialaka getsimplecms, getsimple cms
getsimplecmsOn-prem
Web & CMS Plugins / cms-core

Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/boku7/gsSMTP-Csrf2Xss2RCE/
github.com
http://get-simple.info
get-simple.info
https://github.com/GetSimpleCMS/GetSimpleCMS
github.com
and 2 more references View all →

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