Unrestricted File Upload in matrix-react-sdk (CVE-2021-32622)
Summary
Vulnerability in matrix-react-sdk (CVE-2021-32622). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 3.21.0 or later.
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2021-32622 has been found in matrix-react-sdk.
Risk of unauthorized operations or information disclosure.
What to do: upgrade matrix-react-sdk to 3.21.0 or later.
If unsure, ask your IT team or search "matrix-react-sdk CVE-2021-32622" on the vendor's site.
CVE-2021-32622 (matrix-react-sdk) — CWE-434
Attack vector: local
Patched: 3.21.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-434) exists in matrix-react-sdk.
Check the vendor advisory for the affected versions of matrix-react-sdk.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 3.21.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'matrix-react-sdk' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'matrix-react-sdk' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
matrix-react-sdkを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade matrix-react-sdk to 3.21.0ステージング環境で 3.21.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web npmjs.com