SB2025101036 - Multiple vulnerabilities in BigBlueButton

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Resource exhaustion (CVE-ID: CVE-2025-61602)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper validation for the "reactionEmojiId" parameter when reacting to messages. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

2) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2025-61601)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper conditions check within PollSubmitVote GraphQL mutation. A remote attacker can pass specially crafted input to the application and cause a denial of service condition on the target system.

3) Stored cross-site scripting (CVE-ID: CVE-2025-55200)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within the "Shared Notes" feature. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Remediation

Install update from vendor's website.

References

• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-5m8m-h7fj-8wx6
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-9jv9-cjrm-grj2