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CVE-2021-37859— Reflected XSS in OAuth Flow

Quick assessment

Affected
Mattermost Mattermost
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.

Mattermost Server是美国Mattermost公司的一套开源的消息传递平台。 Mattermost Server 存在跨站脚本漏洞，该漏洞源于启用 OAuth 的 Mattermost 实例存在跨站脚本漏洞。

CVSS 7.1 · High EPSS 3.29% · P88

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2021-37859

Vulnerability Information
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Vulnerability Title
Reflected XSS in OAuth Flow
Source: CVE Program / CVE List V5
Vulnerability Description
Fixed a bypass for a reflected cross-site scripting vulnerability affecting OAuth-enabled instances of Mattermost.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost Server 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost Server是美国Mattermost公司的一套开源的消息传递平台。 Mattermost Server 存在跨站脚本漏洞，该漏洞源于启用 OAuth 的 Mattermost 实例存在跨站脚本漏洞。
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
Mattermost Mattermost 5.34.5 -

II. Public POCs for CVE-2021-37859

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III. Intelligence Information for CVE-2021-37859

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Other References for CVE-2021-37859 (1)

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-79

V. Comments for CVE-2021-37859

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