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CVE-2021-21320— User content sandbox can be confused into opening arbitrary documents

Quick assessment

Affected
matrix-org matrix-react-sdk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Travis Ralston matrix-react-sdk是 （Travis Ralston）开源的一个应用软件。用于将Matrix聊天/语音客户端插入网页。 matrix-react-sdk before version 3.15.0 存在安全漏洞，该漏洞源于用户内容沙箱可能会被滥用来欺骗用户打开意外的文档。

CVSS 2.6 · Low EPSS 0.92% · P60

Possible ATT&CK Techniques 1 AI

T1566.002 · Spearphishing Link
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I. Basic Information for CVE-2021-21320

Vulnerability Information
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Vulnerability Title
User content sandbox can be confused into opening arbitrary documents
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
matrix-react-sdk 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Travis Ralston matrix-react-sdk是 （Travis Ralston）开源的一个应用软件。用于将Matrix聊天/语音客户端插入网页。 matrix-react-sdk before version 3.15.0 存在安全漏洞，该漏洞源于用户内容沙箱可能会被滥用来欺骗用户打开意外的文档。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
matrix-org matrix-react-sdk < 3.15.0 -

II. Public POCs for CVE-2021-21320

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III. Intelligence Information for CVE-2021-21320

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Patches & Fixes for CVE-2021-21320 (1)

Vendor Advisories for CVE-2021-21320 (1)

Other References for CVE-2021-21320 (1)

IV. Related Vulnerabilities

Same product: matrix-react-sdk
Same vendor: matrix-org
Same weakness: CWE-345