# CVE-2024-42347: URL preview setting for a room is controllable by the homeserver in matrix-react-sdk > A malicious homeserver can force URL previews in encrypted rooms, leaking URLs from encrypted messages to the server. - **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 6 Aug 2024 - **Updated:** 8 Aug 2024 - **Also known as:** GHSA-f83w-wqhc-cfp4, openSUSE-SU-2024:14242-1, openSUSE-SU-2024:14273-1 ## What is CVE-2024-42347? CVE-2024-42347 is a high-severity vulnerability in matrix-org matrix-react-sdk, published on 6 Aug 2024. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description 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. Weakness: CWE-359 (Exposure of Private Personal Information to an Unauthorized Actor) ## Which versions are affected by CVE-2024-42347? 2 open source packages ship an affected version, including matrix-react-sdk. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `matrix-react-sdk` | npm | All versions | 3.105.1 | | `matrix-react-sdk` | npm | All versions | 3.105.1 | | `element-desktop` | openSUSE:Tumbleweed | All versions | 1.11.73-1.1 | | `element-web` | openSUSE:Tumbleweed | All versions | 1.11.73-1.1 | Products: Matrix Matrix-React-Sdk. ## How do I fix CVE-2024-42347? Upgrade matrix-react-sdk to 3.105.1 or later. ## Is CVE-2024-42347 being exploited? There is no known exploitation of CVE-2024-42347 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2024-42347 and fix it if it is affected. What it is: CVE-2024-42347 is a high-severity vulnerability in matrix-org matrix-react-sdk, published on 6 Aug 2024. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2024-42347 in the wild and no public exploit code. Affected packages and fixed versions: - matrix-react-sdk (npm): affected all versions; fixed in 3.105.1 - matrix-react-sdk (npm): affected all versions; fixed in 3.105.1 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2024-42347/ (Markdown: https://insights.sbomify.com/CVE-2024-42347/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2024-42347 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-42347 - OSV: https://osv.dev/vulnerability/CVE-2024-42347 --- From sbomify Insights: https://insights.sbomify.com/CVE-2024-42347/ Summaries are generated and may contain mistakes; the official description above is the record.