Cotonti through 1.0.0 contains an open redirect vulnerability in message.php that base64-decodes the redirect parameter without domain validation. Unauthenticated attackers can craft malicious links with encoded external URLs to redirect users to arbitrary sites via meta refresh tags for phishing attacks.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Active
User action required
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/Cotonti/Cotonti
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/blob/1.0.0/system/common.php
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/issues/1907
disclosure@vulncheck.com
https://github.com/Cotonti/Cotonti/pull/1908
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-me…
disclosure@vulncheck.com