Summary
Matrix SDK for React's URL preview setting for a room is controllable by the homeserver
Workarounds
Deployments that trust their homeservers, as well as closed federations of trusted servers, are not affected.
References
N/A.
Impact
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.
Even if the CVSS score would be 4.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N) the maintainer classifies this as High severity issue.
CVE-2024-42347 has a CVSS score of 4.1 (Medium). The vector is network-reachable, high privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (3.105.1); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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This was patched in matrix-react-sdk 3.105.1.
Frequently Asked Questions
- What is CVE-2024-42347? CVE-2024-42347 is a medium-severity security vulnerability in matrix-react-sdk (npm), affecting versions < 3.105.1. It is fixed in 3.105.1.
- How severe is CVE-2024-42347? CVE-2024-42347 has a CVSS score of 4.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of matrix-react-sdk are affected by CVE-2024-42347? matrix-react-sdk (npm) versions < 3.105.1 is affected.
- Is there a fix for CVE-2024-42347? Yes. CVE-2024-42347 is fixed in 3.105.1. Upgrade to this version or later.
- Is CVE-2024-42347 exploitable, and should I be worried? Whether CVE-2024-42347 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2024-42347 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2024-42347? Upgrade
matrix-react-sdkto 3.105.1 or later.