URL preview setting for a room is controllable by the homeserver in matrix-react-sdk
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-359.
Summary
matrix-react-sdk is a react-based SDK for inserting a Matrix chat/voip client into a web page. A malicious homeserver could manipulate a user's account data to cause the client to enable URL previews in end-to-end encrypted rooms, in which case any URLs in encrypted messages would be sent to the server. This was patched in matrix-react-sdk 3.105.0. Deployments that trust their homeservers, as well as closed federations of trusted servers, are not affected. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| matrix-org | matrix-react-sdk | before 3.105.1 | 3.105.1 | Patch available | CNA |
| — | matrix-react-sdk (npm) | before 3.105.1 | 3.105.1 | Patch available | GHSA-f83w-wqhc-cfp4 |
- matrix-react-sdk Vendormatrix-org Affected before 3.105.1 Fixed in 3.105.1 Patch available CNA
- matrix-react-sdk (npm) Vendor— Affected before 3.105.1 Fixed in 3.105.1 Patch available GHSA-f83w-wqhc-cfp4
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:matrix:matrix-react-sdk:*:*:*:*:*:*:*:* | before 3.105.1 | Vulnerable | matrix-org |
- cpe:2.3:a:matrix:matrix-react-sdk:*:*:*:*:*:*:*:* Versions before 3.105.1 Vulnerable ·matrix-org
Remediation
- Fix · CNA matrix-react-sdk (matrix-org) Fixed in 3.105.1
- Fix · GHSA-f83w-wqhc-cfp4 matrix-react-sdk (npm) Fixed in 3.105.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-42347
- 2026-10-03 Alias added: GHSA-f83w-wqhc-cfp4
References
Sources
- CVE-2024-42347 · CVE Program
- CVE-2024-42347 · NVD
- FIRST EPSS
- GHSA-f83w-wqhc-cfp4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences