# CVE-2025-56219: Ascertia SigningHub improper access control in Add User API

Source: https://junglewise.ai/threats/cve-2025-56219-ascertia-signinghub-improper-access-control-in-add-user-api  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-10-20. Updated: 2026-07-05  
License: CC BY 4.0 with a link back

CVE-2025-56219 · Severity: high · CVSS 7.1 · Published 2025-10-20

SigningHub is a digital signature and document workflow platform used to manage legally binding electronic signatures. A security flaw in the user management system allows an attacker to rapidly create an unlimited number of new user accounts. This can overwhelm the system's database and storage, potentially leading to a complete service outage or significant performance degradation.

Technologies: [Ascertia Signinghub](https://junglewise.ai/threats/technologies/signinghub). Vendors: [Ascertia](https://junglewise.ai/threats/vendors/ascertia).

## Quick answers

**Is CVE-2025-56219 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-56219 being exploited in the wild.

**How severe is CVE-2025-56219?** High severity, with a CVSS score of 7.1, published 20 October 2025.

**Which products and versions are affected?** Ascertia Signinghub <= 8.6.8.

**Is there a fix for CVE-2025-56219?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-56219 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-56219?** Check whether you run Ascertia Signinghub at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An improper access control vulnerability exists in the 'Add User' API of Ascertia SigningHub versions up to and including 8.6.8. The affected component lacks rate limiting or throttling mechanisms, allowing an authenticated attacker to automate the creation of a large volume of user accounts. This can result in database bloating and resource exhaustion, ultimately causing a Denial of Service (DoS) condition. The vulnerability is triggered via network requests to the API; while the CVSS vector indicates low privileges are required, the lack of registration controls effectively allows for automated exploitation. A fix is available in versions subsequent to 8.6.8.

## Affected products

- Ascertia SigningHub <= 8.6.8

## Timeline

- 2025-10-20: disclosed
- 2025-10-20: advisory

## References

- [http://signinghub.com/](http://signinghub.com/)
- [https://github.com/saykino/CVE-2025-56219](https://github.com/saykino/CVE-2025-56219)

## Related threats

- [An open redirect in Ascertia SigningHub User v10.0 allows attackers to redirect users to a malicious site via a crafted URL.](https://junglewise.ai/threats/cve-2025-61166-an-open-redirect-in-ascertia-signinghub-user-v10-0-allows)
- [In Ascertia SigningHub through 8.6.8, there is a lack of rate limiting on the reset password function, leading to an…](https://junglewise.ai/threats/cve-2025-54321-in-ascertia-signinghub-through-8-6-8-there-is-a-lack-of-rate)
- [In Ascertia SigningHub through 8.6.8, there is a lack of rate limiting on the invite user function, leading to an…](https://junglewise.ai/threats/cve-2025-54320-in-ascertia-signinghub-through-8-6-8-there-is-a-lack-of-rate)
- [Ascertia SigningHub OTP verification bypass via brute force](https://junglewise.ai/threats/cve-2025-56224-ascertia-signinghub-otp-verification-bypass-via-brute-force)
- [Ascertia SigningHub denial of service in UploadStreamDocument](https://junglewise.ai/threats/cve-2025-56223-ascertia-signinghub-denial-of-service-in-uploadstreamdocument)