CVE-2021-21320

MediumCVSS 4.3/10Last modified Jun 17, 2026

Description

matrix-react-sdk is an npm package which is a Matrix SDK for React Javascript. In matrix-react-sdk before version 3.15.0, the user content sandbox can be abused to trick users into opening unexpected documents. The content is opened with a `blob` origin that cannot access Matrix user data, so messages and secrets are not at risk. This has been fixed in version 3.15.0.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-345

Affected software

Vendor	Product	Versions
matrix-org	matrix-react-sdk	< 3.15.0

References

https://github.com/matrix-org/matrix-react-sdk/commit/b386f0c73b95ecbb6ea7f8f79c6ff5171a8dedd1Patch, Third Party Advisory
https://github.com/matrix-org/matrix-react-sdk/pull/5657Patch, Third Party Advisory
https://github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-52mq-6jcv-j79xThird Party Advisory
https://www.npmjs.com/package/matrix-react-sdkProduct, Third Party Advisory
https://github.com/matrix-org/matrix-react-sdk/commit/b386f0c73b95ecbb6ea7f8f79c6ff5171a8dedd1Patch, Third Party Advisory
https://github.com/matrix-org/matrix-react-sdk/pull/5657Patch, Third Party Advisory
https://github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-52mq-6jcv-j79xThird Party Advisory
https://www.npmjs.com/package/matrix-react-sdkProduct, Third Party Advisory

Timeline

Published: Mar 2, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-2132110.0fastify-reply-from is an npm package which is a fastify plugin to forward the current http request to another server. In fastify-reply-from CVE-2021-213229.8fastify-http-proxy is an npm package which is a fastify plugin for proxying your http requests to another server, with hooks. By crafting a CVE-2021-213235.3Brave is an open source web browser with a focus on privacy and security. In Brave versions 1.17.73-1.20.103, the CNAME adblocking feature a CVE-2021-213246.5GLPI is an open-source asset and IT management software package that provides ITIL Service Desk features, licenses tracking and software aud CVE-2021-213254.8GLPI is an open-source asset and IT management software package that provides ITIL Service Desk features, licenses tracking and software aud CVE-2021-213266.5GLPI is an open-source asset and IT management software package that provides ITIL Service Desk features, licenses tracking and software aud CVE-2021-213277.5GLPI is an open-source asset and IT management software package that provides ITIL Service Desk features, licenses tracking and software aud CVE-2021-213285.3Vapor is a web framework for Swift. In Vapor before version 4.40.1, there is a DoS attack against anyone who Bootstraps a metrics backend fo CVE-2021-213299.8RATCF is an open-source framework for hosting Cyber-Security Capture the Flag events. In affected versions of RATCF users with multi factor CVE-2021-213306.1aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In aiohttp before version 3.7.4 there is an open redirect vu CVE-2021-213313.3The Java client for the Datadog API before version 1.0.0-beta.9 has a local information disclosure of sensitive information downloaded via t CVE-2021-213328.2Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant