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    CVE-2025-54320

    In Ascertia SigningHub through 8.6.8, there is a lack of rate limiting on the invite user function, leading to an email bombing vulnerability. An authenticated attacker can exploit this by automating invite requests.

    Published:Nov 18, 2025
    Last Modified:Nov 20, 2025
    EPS:Nov 18, 2025
    EPSS Score:0.00039
    CVSS Score:4.3

    Affected Products

    Vendor
    Ascertia
    Product
    Signinghub

    Exploits

    https://github.com/saykino/CVE-2025-54320

    Related CVEs

    CVE-2025-61166 (CVSS 6.1) — An open redirect in Ascertia SigningHub User v10.0 allows attackers to redirect users to a malicious site via …
    CVE-2025-54321 (CVSS 9.8) — In Ascertia SigningHub through 8.6.8, there is a lack of rate limiting on the reset password function, leading…
    CVE-2025-56223 (CVSS 7.5) — A lack of rate limiting in the component /Home/UploadStreamDocument of SigningHub v8.6.8 allows attackers to c…
    CVE-2025-56219 (CVSS 7.1) — Incorrect access control in SigningHub v8.6.8 allows attackers to arbitrarily add user accounts without any ra…
    CVE-2025-56224 (CVSS 8.1) — A lack of rate limiting in the One-Time Password (OTP) verification endpoint of SigningHub v8.6.8 allows attac…
    CVE-2025-56218 (CVSS 9.8) — An arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers to execute arbitrary code via upl…
    CVE-2025-56221 (CVSS 9.8) — A lack of rate limiting in the login mechanism of SigningHub v8.6.8 allows attackers to bypass authentication …

    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