Unknown · Matrix-React-Sdk · CVE-2021-21320
**Name of the Vulnerable Software and Affected Versions**
matrix-react-sdk versions prior to 3.15.0
**Description**
The user content sandbox in matrix-react-sdk can be abused to trick users into opening unexpected documents. This is achieved through several user interactions, allowing the content to be opened with a `blob` origin. However, it is noted that the content opened in this manner cannot access Matrix user data, so messages and secrets are not at risk.
**Recommendations**
For versions prior to 3.15.0, update to version 3.15.0 to resolve the issue. As a temporary workaround, consider restricting user interactions that could lead to the abuse of the user content sandbox until the update is applied.