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7.5
HIGH CVSS 3.1
CVE-2025-56223
SigningHub File Upload DoS Vulnerability
Description

A lack of rate limiting in the component /Home/UploadStreamDocument of SigningHub v8.6.8 allows attackers to cause a Denial of Service (DoS) via uploading an excessive number of files.

INFO

Published Date :

Oct. 20, 2025, 1:15 p.m.

Last Modified :

Oct. 27, 2025, 1:52 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2025-56223 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Ascertia signinghub
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Implement rate limiting on the file upload functionality to prevent excessive uploads.
  • Enforce rate limiting on the /Home/UploadStreamDocument endpoint.
  • Configure upload limits per user or IP address.
  • Monitor upload activity for suspicious patterns.
  • Update SigningHub to the latest version if available.
Public PoC/Exploit Available at Github

CVE-2025-56223 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-56223.

URL Resource
http://ascertia.com Product
http://signinghub.com Product
https://github.com/saykino/CVE-2025-56223 Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-56223 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-56223 weaknesses.

CAPEC-125: Flooding Flooding CAPEC-130: Excessive Allocation Excessive Allocation CAPEC-147: XML Ping of the Death XML Ping of the Death CAPEC-197: Exponential Data Expansion Exponential Data Expansion CAPEC-229: Serialized Data Parameter Blowup Serialized Data Parameter Blowup CAPEC-230: Serialized Data with Nested Payloads Serialized Data with Nested Payloads CAPEC-231: Oversized Serialized Data Payloads Oversized Serialized Data Payloads CAPEC-469: HTTP DoS HTTP DoS CAPEC-482: TCP Flood TCP Flood CAPEC-486: UDP Flood UDP Flood CAPEC-487: ICMP Flood ICMP Flood CAPEC-488: HTTP Flood HTTP Flood CAPEC-489: SSL Flood SSL Flood CAPEC-490: Amplification Amplification CAPEC-491: Quadratic Data Expansion Quadratic Data Expansion CAPEC-493: SOAP Array Blowup SOAP Array Blowup CAPEC-494: TCP Fragmentation TCP Fragmentation CAPEC-495: UDP Fragmentation UDP Fragmentation CAPEC-496: ICMP Fragmentation ICMP Fragmentation CAPEC-528: XML Flood XML Flood

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
nomi-sec/PoC-in-GitHub

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 4 hours, 50 minutes ago
7368 stars 1215 fork 1215 watcher
Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 827 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-56223 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-56223 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Oct. 27, 2025

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:ascertia:signinghub:*:*:*:*:*:*:*:* versions up to (including) 8.6.8
    Added Reference Type MITRE: http://ascertia.com Types: Product
    Added Reference Type MITRE: http://signinghub.com Types: Product
    Added Reference Type MITRE: https://github.com/saykino/CVE-2025-56223 Types: Third Party Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 20, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-770
  • New CVE Received by [email protected]

    Oct. 20, 2025

    Action Type Old Value New Value
    Added Description A lack of rate limiting in the component /Home/UploadStreamDocument of SigningHub v8.6.8 allows attackers to cause a Denial of Service (DoS) via uploading an excessive number of files.
    Added Reference http://ascertia.com
    Added Reference http://signinghub.com
    Added Reference https://github.com/saykino/CVE-2025-56223
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact