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    CVE-2026-93869

    Cotonti through 1.0.0 contains an open redirect vulnerability in the cot_url_check() function that validates redirect destinations using a regular expression lacking an end-of-string anchor. Attackers can bypass the redirect guard by supplying hostnames beginning with the site domain to redirect users to attacker-controlled hosts through the ratings plugin or other redirect callers.

    Published:Sep 18, 2026
    Last Modified:Sep 21, 2026
    EPS:Sep 18, 2026
    EPSS Score:0.00217
    CVSS Score:6.1

    Affected Products

    Vendor
    Cotonti
    Product
    Cotonti
    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

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    CVE-2026-93871 (CVSS 5.1) — Cotonti through 1.0.0 fails to validate redirect destinations in page bodies prefixed with redir:, allowing au…
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    CVE-2026-91939 (CVSS 9.3) — Cotonti 1.0.0 Comments plugin passes the ci GET parameter to unserialize() without allowed_classes restriction…
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    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