CVE-2026-100523

Summary

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.

Affected Software

Weaknesses

• CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

References

• https://github.com/Cotonti/Cotonti/issues/1907
• https://github.com/Cotonti/Cotonti/pull/1908
• https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php
• https://github.com/Cotonti/Cotonti/blob/1.0.0/system/common.php
• https://github.com/Cotonti/Cotonti
• https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-message-php-redirect-parameter

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