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CVE-2026-46404— BigBlueButton: Presentation URL Security Hardening

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社区开源的一套开源的Web会议系统。 BigBlueButton 3.0.23之前版本存在服务端请求伪造漏洞，该漏洞源于演示文稿URL验证未正确限制对站点本地和链路本地地址的访问，可能导致服务端请求伪造攻击。

CVSS 6.8 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
bigbluebutton bigbluebutton < 3.0.23 affected
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I. Basic Information for CVE-2026-46404

Vulnerability Information
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Vulnerability Title
BigBlueButton: Presentation URL Security Hardening
Source: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, the presentation URL validation did not properly restrict access to site local and link local addresses. The redirect following logic now pins resolved IPs. This issue is fixed in version 3.0.23.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BigBlueButton是BigBlueButton社区开源的一套开源的Web会议系统。 BigBlueButton 3.0.23之前版本存在服务端请求伪造漏洞，该漏洞源于演示文稿URL验证未正确限制对站点本地和链路本地地址的访问，可能导致服务端请求伪造攻击。
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 < 3.0.23 -

II. Public POCs for CVE-2026-46404

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III. Intelligence Information for CVE-2026-46404

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Vendor Advisories for CVE-2026-46404 (1)

Same Patch Batch · bigbluebutton · 2026-07-16 · 3 CVEs total

CVE-2026-46351 8.1 HIGH BigBlueButton: Insecure Randomness allows to guess user's conference session token and imp
CVE-2026-46353 8.1 HIGH BigBlueButton API checksum bypass via presentationUploadExternalUrl

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-918

V. Comments for CVE-2026-46404

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