CVE-2023-42803— BigBlueButton Unrestricted File Upload vulnerability
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I. Basic Information for CVE-2023-42803
Vulnerability Information
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Vulnerability Title
BigBlueButton Unrestricted File Upload vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.2 is vulnerable to unrestricted file upload, where the insertDocument API call does not validate the given file extension before saving the file, and does not remove it in case of validation failures. BigBlueButton 2.6.0-beta.2 contains a patch. 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:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
危险类型文件的不加限制上传
Source: NVD (National Vulnerability Database)
Vulnerability Title
BigBlueButton 代码问题漏洞
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之前版本存在代码问题漏洞，该漏洞源于insertDocument API存在文件上传漏洞。
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 | < 2.6.0-beta.2 | - |
II. Public POCs for CVE-2023-42803
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/bigbluebutton/bigbluebutton/pull/15990x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2023-42803
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-2023-42804 | 3.1 LOW | BigBlueButton Path Traversal – Reading Certain File Extensions |
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-434
- CVE-2021-47943
TextPattern CMS 4.8.7 Remote Code Execution via File Upload - CVE-2021-47937
e107 CMS 2.3.0 Authenticated Remote Code Execution via Theme - CVE-2026-41517
Emlog: Remote Code Execution via Malicious Plugin Upload - CVE-2026-6692
Slider Revolution 7.0.0 - 7.0.10 - Authenticated (Subscriber - CVE-2026-41587
CI4MS: Unrestricted PHP File Upload via Theme Installation L
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