Auth bypass in Pantherius Modal Survey

CVE-2026-66634

Subscriber Insecure Direct Object References (IDOR) in Modal Survey <= 2.0.2.2.3 versions.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (17.4th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-66634: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-66634?
CVE-2026-66634 is a medium-severity vulnerability in Pantherius Modal Survey, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-08-18.
How severe is CVE-2026-66634?
Medium severity. CVSS v3 base score is 4.3 out of 10.