BigBlueButton up to 3.0.20 Util Util.java random values

CVSS Meta Temp Score
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CTI Interest Score
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3.0$0-$5k1.40

Summaryinfo

A vulnerability classified as problematic has been found in BigBlueButton up to 3.0.20. Affected is an unknown function of the file bbb-common-web/src/main/java/org/bigbluebutton/api/Util.java of the component Util. This manipulation causes random values. The identification of this vulnerability is CVE-2026-46351. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in BigBlueButton up to 3.0.20. It has been declared as problematic. Affected by this vulnerability is some unknown processing of the file bbb-common-web/src/main/java/org/bigbluebutton/api/Util.java of the component Util. The manipulation with an unknown input leads to a random values vulnerability. The CWE definition for the vulnerability is CWE-330. The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers. As an impact it is known to affect confidentiality. The summary by CVE is:

BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web generated conference sessionToken values with insufficiently secure randomness in bbb-common-web/src/main/java/org/bigbluebutton/api/Util.java and bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy, allowing a session user to predict other users' conference session tokens and impersonate them. This issue is fixed in version 3.0.21.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-46351 since 05/13/2026. The exploitation appears to be difficult. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1600.001 for this issue.

Upgrading to version 3.0.21 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.1
VulDB Meta Temp Score: 3.0

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Random values
CWE: CWE-330 / CWE-310
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: BigBlueButton 3.0.21

Timelineinfo

05/13/2026 CVE reserved
07/16/2026 +64 days Advisory disclosed
07/16/2026 +0 days VulDB entry created
07/16/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-46351 (🔒)
GCVE (CVE): GCVE-0-2026-46351
GCVE (VulDB): GCVE-100-379609

Entryinfo

Created: 07/16/2026 20:33
Changes: 07/16/2026 20:33 (53)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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