In short
- CVE-2023-30609 is a MEDIUM (CVSS 4.7) vulnerability affecting matrix-react-sdk (matrix-react-sdk project), matrix-react-sdk.
- Chance of exploitation in the next 30 days (EPSS): 0.62%, higher than 49.6% of all vulnerabilities.
- Fix: update to 3.71.0 or later.
Description
Impact
Plain text messages containing HTML tags are rendered as HTML in the search results. To exploit this, an attacker needs to trick a user into searching for a specific message containing an HTML injection payload.
Cross-site scripting is possible by including resources from recaptcha.net and gstatic.com which are included in the default CSP.
Thanks to Cadence Ember for finding the injection and to S1m for finding possible XSS vectors.
Patches
Version 3.71.0 of the SDK fixes the issue.
Workarounds
Restarting the client will clear the injection.
NVD description
matrix-react-sdk is a react-based SDK for inserting a Matrix chat/VoIP client into a web page. Prior to version 3.71.0, plain text messages containing HTML tags are rendered as HTML in the search results. To exploit this, an attacker needs to trick a user into searching for a specific message containing an HTML injection payload. No cross-site scripting attack is possible due to the hardcoded content security policy. Version 3.71.0 of the SDK patches over the issue. As a workaround, restarting the client will clear the HTML injection.
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