CVE-2021-45900: Vivoh Webinar Manager before 3.6.3.0 has improper API authentication

Q: How do I fix CVE-2021-45900?

webinar manager: upgrade to 3.6.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-45900 being exploited?

CVE-2021-45900 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-45900 affect?

CVE-2021-45900 affects webinar manager. Severity is medium (CVSS 6.5). 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 successf

Q: How urgent is CVE-2021-45900?

Priority 41/100. Public exploit reference

This month

MEDIUM 6.5UPGRADE

CVE-2021-45900 is a medium-severity flaw (CVSS 6.5) affecting webinar manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-287
Published	2022-03-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: vivoh

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-03-30 22:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

vivoh webinar manager UPGRADE

Affected: < 3.6.3.0

Fixed in: 3.6.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webinar-manager || rpm -q webinar-manager || webinar-manager --version

2. UPGRADE to 3.6.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webinar-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webinar-manager

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-45900?

webinar manager: upgrade to 3.6.3.0. Exact commands for each OS are on this page.

Is CVE-2021-45900 being exploited?

CVE-2021-45900 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-45900 affect?

CVE-2021-45900 affects webinar manager. Severity is medium (CVSS 6.5). 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 successf

How urgent is CVE-2021-45900?

Priority 41/100. Public exploit reference

References

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