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CVE-2023-43797— BigBlueButton Stored Cross-site Scripting vulnerability at Guest Lobby

Quick assessment

Affected
bigbluebutton bigbluebutton
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 2.6.11之前版本，2.7.0-beta.3之前版本存在跨站脚本漏洞，该漏洞源于Guest Lobby存在跨站脚本（XSS）漏洞。

CVSS 6.3 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2023-43797

Vulnerability Information
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Vulnerability Title
BigBlueButton Stored Cross-site Scripting vulnerability at Guest Lobby
Source: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open-source virtual classroom. Prior to versions 2.6.11 and 2.7.0-beta.3, Guest Lobby was vulnerable to cross-site scripting when users wait to enter the meeting due to inserting unsanitized messages to the element using unsafe innerHTML. Text sanitizing was added for lobby messages starting in versions 2.6.11 and 2.7.0-beta.3. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 2.6.11之前版本，2.7.0-beta.3之前版本存在跨站脚本漏洞，该漏洞源于Guest Lobby存在跨站脚本（XSS）漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bigbluebutton bigbluebutton < 2.6.11 -

II. Public POCs for CVE-2023-43797

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III. Intelligence Information for CVE-2023-43797

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Patches & Fixes for CVE-2023-43797 (2)

Vendor Advisories for CVE-2023-43797 (1)

Same Patch Batch · bigbluebutton · 2023-10-30 · 4 CVEs total

CVE-2023-43798 5.6 MEDIUM BigBlueButton Blind SSRF When Uploading Presentation (mitigation bypass)
CVE-2023-42803 5.3 MEDIUM BigBlueButton Unrestricted File Upload vulnerability
CVE-2023-42804 3.1 LOW BigBlueButton Path Traversal – Reading Certain File Extensions

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-79

V. Comments for CVE-2023-43797

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