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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (28.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Matrix-Org Matrix-React-Sdk — versions < 3.21.0
- Matrix-React-Sdk Project
Weakness classification (CWE)
References
- github.com/matrix-org/matrix-react-sdk/security/advisories/GHSA-8796-gc9j-63rv (Patch, Third Party Advisory)
- github.com/matrix-org/matrix-react-sdk/pull/5981 (Patch, Third Party Advisory)
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.