CVE-2023-37259
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
A vulnerability in matrix-react-sdk allows for the injection of malicious code through the Export Chat feature, leading to stored XSS attacks. An attacker can exploit this flaw to leak message contents, although the impact is limited to code running from the `null` origin.
Risk Assessment
The organization may be exposed to the leakage of sensitive message information, potentially compromising user privacy and the company's reputation.
Recommendation
It is recommended to upgrade to version 3.76.0 or later to patch this vulnerability. Alternatively, disabling the Export Chat feature can minimize the risk.
Original NVD description (English source)
matrix-react-sdk is a react-based SDK for inserting a Matrix chat/voip client into a web page. The Export Chat feature includes certain attacker-controlled elements in the generated document without sufficient escaping, leading to stored Cross site scripting (XSS). Since the Export Chat feature generates a separate document, an attacker can only inject code run from the `null` origin, restricting the impact. However, the attacker can still potentially use the XSS to leak message contents. A malicious homeserver is a potential attacker since the affected inputs are controllable server-side. This issue has been addressed in commit `22fcd34c60` which is included in release version 3.76.0. Users are advised to upgrade. The only known workaround for this issue is to disable or to not use the Export Chat feature.