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Vulnerability DatabaseCVE-2021-21320
CVE-2021-21320:
JavaScript vulnerability analysis and mitigation
Overview
CVE-2021-21320 is a security vulnerability affecting the matrix-react-sdk package versions below 3.15.0. The vulnerability was discovered and disclosed on March 1, 2021. It impacts the user content sandbox functionality of the Matrix client application (GitHub Advisory).
Technical details
The vulnerability exists in the user content sandbox implementation where it can be manipulated to open unexpected documents after several user interactions. The critical aspect is that the content can be opened with a blob origin from the Matrix client, potentially allowing malicious documents to access user messages and secrets (GitHub Advisory).
Impact
When successfully exploited, this vulnerability could allow malicious documents to access sensitive user data, including user messages and secrets. The impact is considered moderate as it requires user interaction to exploit (GitHub Advisory).
Mitigation and workarounds
The vulnerability was patched in matrix-react-sdk version 3.15.0 through pull request #5657. Users should upgrade to version 3.15.0 or later to address this security issue. No workarounds are available for unpatched versions (GitHub Advisory).
Additional resources
Source: This report was generated using AI
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