CVE-2021-32622

File upload local preview can run embedded scripts after user interaction

CVSS 4.2 MEDIUMEPSS 0.4%CWE-74

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.2EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

17 May 2021Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Matrix-React-SDK is a react-based SDK for inserting a Matrix chat/voip client into a web page. Before version 3.21.0, when uploading a file, the local file preview can lead to execution of scripts embedded in the uploaded file. This can only occur after several user interactions to open the preview in a separate tab. This only impacts the local user while in the process of uploading. It cannot be exploited remotely or by other users. This vulnerability is patched in version 3.21.0.

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

Affected products

matrix-org · matrix-react-sdk

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References

https://github.com/matrix-org/matrix-react-sdk/pull/5981 https://github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-8796-gc9j-63rv