What is CVE-2021-32622?

CVE-2021-32622 is a medium-severity vulnerability in Matrix-Org Matrix-React-Sdk, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.2/10. Published 2021-05-17.

How severe is CVE-2021-32622?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Arbitrary file upload in Matrix-Org Matrix-React-Sdk

CVE-2021-32622

Matrix-React-SDK is a react-based SDK for inserting a Matrix chat/voip client into a web page. Before version 3.21.0, when uploading a file, the local file preview can lead to execution of scripts embedded in the uploaded file. This can only occur after several user interactions to open the preview in a separate tab. This only impacts the local user while in the process of uploading. It cannot be exploited remotely or by other users. This vulnerability is patched in version 3.21.0.

EPSS: 0.004 (30.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L.

Affected products

Matrix-org Matrix-react-sdk — versions < 3.21.0
Matrix-react-sdk_project Matrix-react-sdk

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-32622?: CVE-2021-32622 is a medium-severity vulnerability in Matrix-Org Matrix-React-Sdk, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.2/10. Published 2021-05-17.
How severe is CVE-2021-32622?: Medium severity. CVSS v3 base score is 4.2 out of 10.