CVE-2022-31064Public exploitNetwork attack vector

Browser script execution via unsanitized chat username

Published Jun 27, 2022 · Updated Apr 22, 2025

Stored XSS in BigBlueButton before 2.4.8 allows remote attackers to execute JavaScript in a participant's browser via private chat. The HTML5 client's chat alert rendering inserted a sender's crafted display name through innerHTML-style sinks without neutralizing executable markup. Exploitation requires a meeting with private chat enabled and a victim who receives the attacker's message; script runs in the victim's BigBlueButton origin.

CVSS severity6.5
Medium
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in BigBlueButton before 2.4.8 allows remote attackers to execute JavaScript in a participant's browser via private chat. The HTML5 client's chat alert rendering inserted a sender's crafted display name through innerHTML-style sinks without neutralizing executable markup. Exploitation requires a meeting with private chat enabled and a victim who receives the attacker's message; script runs in the victim's BigBlueButton origin.

The record

CVE
CVE-2022-31064
Published
Jun 27, 2022
Updated
Apr 22, 2025
Vendor
BigBlueButton Inc.
Product
BigBlueButton
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 2.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BigBlueButton Inc. · BigBlueButtonversion=< 2.4.8

Published CVSS scores

7.2GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
6.5GitHub CNACVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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