Skip to content

File upload local preview can run embedded scripts after user interaction

Moderate severity GitHub Reviewed Published May 17, 2021 in matrix-org/matrix-react-sdk • Updated Jan 9, 2023

Package

npm matrix-react-sdk (npm)

Affected versions

< 3.21.0

Patched versions

3.21.0

Description

Impact

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.

Patches

This has been fixed by matrix-org/matrix-react-sdk#5981, which is included in 3.21.0.

Workarounds

There are no known workarounds.

References

@jryans jryans published to matrix-org/matrix-react-sdk May 17, 2021
Reviewed May 17, 2021
Published to the GitHub Advisory Database May 17, 2021
Last updated Jan 9, 2023

Severity

Moderate
4.2
/ 10

CVSS base metrics

Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

Weaknesses

CVE ID

No known CVE

GHSA ID

GHSA-8796-gc9j-63rv

Source code

Credits

Checking history
See something to contribute? Suggest improvements for this vulnerability.