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CVE-2025-54320

MediumPublished

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...

Published: Nov 18, 2025
Updated: Nov 19, 2025
Assigning CNA: mitre
Evidence observed: Aug 6, 2026

Primary CVSS

4.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 26.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2025-54320PoC
Proof-of-concept for CVE-2025-54320: an email bombing vulnerability in Ascertia SigningHub's Invite User API due to missing rate limiting, allowing authenticated remote attackers to flood target inboxes.

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