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    CVE-2026-88896

    EspoCRM before 10.0.4 is vulnerable to server-side request forgery. HostCheck::ipAddressIsNotInternal(), which validates outbound URLs to block requests to internal/private IP addresses, strips ::ffff: (IPv4-mapped IPv6) prefixes but does not recognize IPv6 transition addresses that embed private IPv4 addresses: NAT64 (64:ff9b::), 6to4 (2002::), and Teredo (2001:0000::). An attacker who controls a domain with AAAA records pointing to such transition addresses can bypass both the internal-host validation and the CURLOPT_RESOLVE IP-pinning check, causing EspoCRM to issue outbound requests to internal network services. Affected paths include POST /Attachment/fromImageUrl, reachable by any authenticated user with attachment access, and outbound webhook delivery, which requires an admin or API user.

    Published:Sep 10, 2026
    Last Modified:Sep 10, 2026
    EPS:Sep 10, 2026
    EPSS Score:
    CVSS Score:5.3

    Affected Products

    Vendor
    Espocrm
    Product
    Espocrm

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

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    CVE-2026-33741 (CVSS 6.8) — EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below allow authent…
    CVE-2026-33733 (CVSS 7.2) — EspoCRM is an open source customer relationship management application. Prior to version 9.3.4, the admin temp…
    CVE-2026-33656 (CVSS 9.1) — EspoCRM is an open source customer relationship management application. Prior to version 9.3.4, EspoCRM's buil…
    CVE-2026-33740 (CVSS 5.4) — EspoCRM is an open source customer relationship management application. In versions 9.3.3 and below, the POST …
    CVE-2026-33659 (CVSS 3.5) — EspoCRM is an open source customer relationship management application. In versions 9.3.3 and below, the POST …
    CVE-2026-33657 (CVSS 4.6) — EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have a stored…
    CVE-2026-33534 (CVSS 4.3) — EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have an authe…
    CVE-2020-37094 (CVSS 8.6) — EspoCRM 5.7.0 prior to 5.9.0 contains an authentication token reuse vulnerability that allows authenticated at…

    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
    CVE-2026-88896 — Espocrm (Medium 6.9) | CVE-DB