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    CVE-2026-100523

    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.

    Published:Sep 26, 2026
    Last Modified:Oct 5, 2026
    EPS:Sep 26, 2026
    EPSS Score:0.00188
    CVSS Score:6.1

    Affected Products

    Vendor
    Cotonti
    Product
    Cotonti Siena
    Vendor
    Cotonti
    Product
    Siena

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-178 Cross-Site Flashing

    Related CVEs

    CVE-2026-121553 (CVSS 6.3) — Cotonti through 1.0.0 generates registration and email-change validation tokens with md5(microtime()), allowin…
    CVE-2026-101093 (CVSS 5.3) — Cotonti through 1.0.0 contains a cross-site request forgery vulnerability in admin.users.php that allows attac…
    CVE-2026-100524 (CVSS 5.3) — Cotonti through 1.0.0 contains a cross-site request forgery vulnerability in the extensions manager that allow…
    CVE-2026-100522 (CVSS 5.1) — Cotonti through 1.0.0 contains a reflected cross-site scripting vulnerability in message.php where the lng par…
    CVE-2026-100521 (CVSS 5.1) — Cotonti through 1.0.0 contains a reflected cross-site scripting vulnerability in the search plugin highlight p…
    CVE-2026-93873 (CVSS 5.3) — Cotonti through 1.0.0 fails to validate anti-CSRF tokens in the contact plugin submission handler, allowing at…
    CVE-2026-93872 (CVSS 7.7) — Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in t…
    CVE-2026-93871 (CVSS 5.1) — Cotonti through 1.0.0 fails to validate redirect destinations in page bodies prefixed with redir:, allowing au…
    CVE-2026-93870 (CVSS 5.3) — Cotonti through 1.0.0 fails to validate anti-CSRF tokens in the ratings plugin AJAX handler, allowing attacker…
    CVE-2026-93869 (CVSS 5.3) — Cotonti through 1.0.0 contains an open redirect vulnerability in the cot_url_check() function that validates r…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High