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Medium · 6.1 CVE-2026-100523 EUVD-2026-87378GHSA-g8jm-3grw-8wh2

Cotonti through 1.0.0 Open Redirect via message.php redirect parameter

Published Sep 26, 2026 · Updated Oct 5, 2026 · Assigned by VulnCheck

Description

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 products

VendorProductAffectedFixed
Cotonti Cotonti ≤ 1.0.0 —

References