File upload local preview can run embedded scripts after user interaction
Priority LOW 38CWE-74Published · Updated
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
### 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 https://github.com/matrix-org/matrix-react-sdk/pull/5981, which is included in 3.21.0. ### Workarounds There are no known workarounds.
Why it matters now
Fix Fixed matrix-react-sdk (npm): 3.21.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | matrix-react-sdk (npm) | before 3.21.0 | 3.21.0 | Patch available | GHSA-8796-gc9j-63rv |
- matrix-react-sdk (npm) Vendor— Affected before 3.21.0 Fixed in 3.21.0 Patch available GHSA-8796-gc9j-63rv
Remediation
- Fix · GHSA-8796-gc9j-63rv matrix-react-sdk (npm) Fixed in 3.21.0 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-8796-gc9j-63rv
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences