What is CVE-2025-61166?

CVE-2025-61166 is a medium-severity vulnerability in Ascertia Signinghub, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2026-04-06.

How severe is CVE-2025-61166?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Ascertia Signinghub

CVE-2025-61166

An open redirect in Ascertia SigningHub User v10.0 allows attackers to redirect users to a malicious site via a crafted URL.

Vulnerability class: Open Redirect

Published 2026-04-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (6.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Ascertia Signinghub — versions 8.6.8, 10.0

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

linkedin.com/in/thakur-nikhil (Not Applicable)
medium.com/@rajput.thakur/malicious-open-redirection-cve-2025-61166-bf5d708cd241 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-61166?: CVE-2025-61166 is a medium-severity vulnerability in Ascertia Signinghub, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2026-04-06.
How severe is CVE-2025-61166?: Medium severity. CVSS v3 base score is 6.1 out of 10.