CVE Feed

    Dashboard / CVE / CVE-2026-91939

    CVE-2026-91939

    Cotonti 1.0.0 Comments plugin passes the ci GET parameter to unserialize() without allowed_classes restriction, allowing unauthenticated attackers to instantiate arbitrary PHP classes with attacker-controlled properties. Attackers can exploit PHP object injection through crafted serialized payloads to trigger gadget chains and achieve database manipulation or code execution.

    Published:Sep 15, 2026
    Last Modified:Sep 16, 2026
    EPS:Sep 15, 2026
    EPSS Score:0.00594
    CVSS Score:9.8

    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-586 Object Injection

    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-2026-100522 (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-2026-93869 (CVSS 5.3) — Cotonti through 1.0.0 contains an open redirect vulnerability in the cot_url_check() function that validates r…
    CVE-2026-93868 (CVSS 9.2) — Cotonti through 1.0.0 derives password recovery validation tokens from md5(microtime()) in users.passrecover.p…
    CVE-2026-71294 (CVSS 7.6) — Cotonti CMS's Comments plugin deserializes user-supplied data without restricting the classes that may be inst…
    CVE-2026-58144 (CVSS 5.1) — Cotonti Siena 0.9.26 and earlier contains a stored cross-site scripting vulnerability that allows authenticate…

    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