CVE-2025-54320

Name: CVE-2025-54320
Creator: NVD / NIST
Published: 2025-11-18T19:15:48.88+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2025-54320 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

EPSS Probability

0.29%

20.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Ascertia	Signinghub	<= 8.6.8

References

https://github.com/saykino/CVE-2025-54320Third Party Advisory
https://www.ascertia.com/company/vulnerability-disclosure-policy/Vendor Advisory

Timeline

Published: Nov 18, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-54320?

How severe is CVE-2025-54320?

CVE-2025-54320 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2025-54320?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-54320?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST