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WS-2021-0107

Good to know:

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Date: August 19, 2025

In matrix-react-sdk before 3.21.0, when uploading a file, the local file preview can lead to execution of scripts embedded in the uploaded file, but only 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.

Language: TYPE_SCRIPT

Severity Score

Related Resources (4)

https://github.com/matrix-org/matrix-react-sdk/commit/45acf70b00cb0c51740455d09164b1c3c033b5f3
https://github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-8796-gc9j-63rv
https://github.com/matrix-org/matrix-react-sdk
https://www.mend.io/vulnerability-database/WS-2021-0107

Severity Score

Weakness Type (CWE)

Improper Control of Generation of Code ('Code Injection')

CWE-94

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CWE-74

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CWE-78

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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