Critical severity9.1NVD Advisory· Published Aug 13, 2021· Updated Jun 17, 2026
CVE-2021-34823
CVE-2021-34823
Description
The ON24 ScreenShare (aka DesktopScreenShare.app) plugin before 2.0 for macOS allows remote file access via its built-in HTTP server. This allows unauthenticated remote users to retrieve files accessible to the logged-on macOS user. When a remote user sends a crafted HTTP request to the server, it triggers a code path that will download a configuration file from a specified remote machine over HTTP. There is an XXE flaw in processing of this configuration file that allows reading local (to macOS) files and uploading them to remote machines.
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Affected products
1- ON24/ScreenSharedescription
Patches
Vulnerability mechanics
References
2- www.trustwave.com/en-us/resources/security-resources/security-advisories/nvdThird Party Advisory
- www.trustwave.com/en-us/resources/security-resources/security-advisories/nvdThird Party Advisory
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