CVE-2021-21320
LOW2.6EPSS 0.18%User content sandbox can be confused into opening arbitrary documents
Published: 3/3/2021Modified: 3/13/2026
Also known as:GHSA-52mq-6jcv-j79x
Description
### Impact The user content sandbox can be abused to trick users into opening unexpected documents after several user interactions. The content can be opened with a `blob` origin from the Matrix client, so it is possible for a malicious document to access user messages and secrets. ### Patches This has been fixed by https://github.com/matrix-org/matrix-react-sdk/pull/5657, which is included in 3.15.0. ### Workarounds There are no known workarounds.
Affected packages (1)
- npm/matrix-react-sdkfrom 0, < 3.15.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW2.6 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N |
References (5)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-21320
- WEBhttps://github.com/matrix-org/matrix-react-sdk/commit/b386f0c73b95ecbb6ea7f8f79c6ff5171a8dedd1
- WEBhttps://github.com/matrix-org/matrix-react-sdk/pull/5657
- WEBhttps://github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-52mq-6jcv-j79x
- WEBhttps://www.npmjs.com/package/matrix-react-sdk