CVE-2023-42804— BigBlueButton Path Traversal – Reading Certain File Extensions
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I. Basic Information for CVE-2023-42804
Vulnerability Information
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Vulnerability Title
BigBlueButton Path Traversal – Reading Certain File Extensions
Source: NVD (National Vulnerability Database)
Vulnerability Description
BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.1 has a path traversal vulnerability that allows an attacker with a valid starting folder path, to traverse and read other files without authentication, assuming the files have certain extensions (txt, swf, svg, png). In version 2.6.0-beta.1, input validation was added on the parameters being passed and dangerous characters are stripped. There are no known workarounds.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
BigBlueButton 路径遍历漏洞
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 2.6.0之前版本存在路径遍历漏洞，该漏洞源于存在路径遍历漏洞。未经身份验证的攻击者可利用该漏洞遍历和读取文件。
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 | < 2.6.0-beta.1 | - |
II. Public POCs for CVE-2023-42804
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/bigbluebutton/bigbluebutton/pull/15960x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2023-42804
Same Patch Batch · bigbluebutton · 2023-10-30 · 4 CVEs total
| CVE-2023-43797 | 6.3 MEDIUM | BigBlueButton Stored Cross-site Scripting vulnerability at Guest Lobby |
| 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 |
IV. Related Vulnerabilities
Same product: bigbluebutton
- CVE-2026-41127
BigBlueButton's missing authorization allows viewer to injec - CVE-2026-41126
BigBlueButton has Open Redirect through bigbluebutton/api/jo - CVE-2026-27736
BigBlueButton has Open Redirect vulnerability in ApiControll - CVE-2026-27467
BigBlueButton: Audio from participants to the server initial - CVE-2026-27466
BigBlueButton: Exposed ClamAV port enables Denial of Service
Same vendor: bigbluebutton
- CVE-2026-41127
BigBlueButton's missing authorization allows viewer to injec - CVE-2026-41126
BigBlueButton has Open Redirect through bigbluebutton/api/jo - CVE-2026-27736
BigBlueButton has Open Redirect vulnerability in ApiControll - CVE-2026-27467
BigBlueButton: Audio from participants to the server initial - CVE-2026-27466
BigBlueButton: Exposed ClamAV port enables Denial of Service
Same weakness: CWE-22
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