What is CVE-2021-45900?

CVE-2021-45900 is a medium-severity vulnerability in Vivoh Webinar Manager, classified under Improper Authentication. CVSS score: 6.5/10. Published 2022-03-30.

How severe is CVE-2021-45900?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Vivoh Webinar Manager

CVE-2021-45900

Vivoh Webinar Manager before 3.6.3.0 has improper API authentication. When a user logs in to the administration configuration web portlet, a VIVOH_AUTH cookie is assigned so that they can be uniquely identified. Certain APIs can be successfully executed without proper authentication. This can let an attacker impersonate as victim and make state changing requests on their behalf.

Vulnerability class: Broken Authentication

Published 2022-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.007 (53.1th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Vivoh Webinar Manager

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

vivoh.com/wp-content/uploads/2021/11/Vivoh-Webinar-Manager-for-Zoom-Installatio… (Broken Link)
vivoh.com/blog/finra-remediation/ (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2021-45900?: CVE-2021-45900 is a medium-severity vulnerability in Vivoh Webinar Manager, classified under Improper Authentication. CVSS score: 6.5/10. Published 2022-03-30.
How severe is CVE-2021-45900?: Medium severity. CVSS v3 base score is 6.5 out of 10.