CVE-2022-36028Network attack vector

Open redirect via unchecked return cookie

Published Apr 25, 2024 · Updated Aug 3, 2024

Open redirect in BigBlueButton Greenlight before 2.13.0 allows remote attackers to send users to an attacker-controlled site via login. The authenticator concern accepts the return_to cookie as the post-login destination without verifying that its host matches the Greenlight request host. A victim must enter the affected login flow with the crafted cookie, after which Greenlight redirects the browser off-site and enables phishing or credential theft through the destination.

CVSS severity9.1
Critical
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in BigBlueButton Greenlight before 2.13.0 allows remote attackers to send users to an attacker-controlled site via login. The authenticator concern accepts the return_to cookie as the post-login destination without verifying that its host matches the Greenlight request host. A victim must enter the affected login flow with the crafted cookie, after which Greenlight redirects the browser off-site and enables phishing or credential theft through the destination.

The record

CVE
CVE-2022-36028
Published
Apr 25, 2024
Updated
Aug 3, 2024
Vendor
BigBlueButton Inc.
Product
Greenlight
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=-
  2. Affected versionversion=0 <2.13.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BigBlueButton Inc. · Greenlightversion=-; version=0 <2.13.0

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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