CVE-2021-40868

MEDIUM NUCLEI

Cloudron 6.2 - Reflected Cross-Site Scripting via Login Page returnTo Parameter

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-40868. PoCs published by Akıner Kısa. A Nuclei detection template is also available.

AI-analyzed exploit summary This exploit demonstrates a reflected XSS vulnerability in Cloudron 6.2 via the 'returnTo' parameter in the login page. The attacker can inject malicious JavaScript by appending it to the URL, which executes upon successful login.

Description

In Cloudron 6.2, the returnTo parameter on the login page is vulnerable to Reflected XSS.

Exploits (1)

exploitdb WORKING POC
by Akıner Kısa · textwebappsmultiple
https://www.exploit-db.com/exploits/50317

This exploit demonstrates a reflected XSS vulnerability in Cloudron 6.2 via the 'returnTo' parameter in the login page. The attacker can inject malicious JavaScript by appending it to the URL, which executes upon successful login.

Classification
Working Poc 90%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Cloudron 6.2
Auth required
Prerequisites: Access to the Cloudron login page · Valid login credentials to trigger the payload
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Nuclei Templates (1)

Cloudron 6.2 Cross-Site Scripting
MEDIUMby daffainfo

References (3)

Core 3
Core References
Product x_refsource_misc
https://www.cloudron.io/
Exploit, Third Party Advisory, VDB Entry x_refsource_misc
https://packetstormsecurity.com/files/164183/Cloudron-6.2-Cross-Site-Scripting.html

Scores

CVSS v3 6.1
EPSS 0.0907
EPSS Percentile 94.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
cloudron/cloudron 6.2
Published Sep 21, 2021
Tracked Since Feb 18, 2026