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CVE-2023-29196— HTML injection via topic embedding in Discourse

CVSS 4.2 · Medium EPSS 0.29% · P53
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I. Basic Information for CVE-2023-29196

Vulnerability Information
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Vulnerability Title
HTML injection via topic embedding in Discourse
Source: NVD (National Vulnerability Database)
Vulnerability Description
Discourse is an open source platform for community discussion. This vulnerability is not exploitable on the default install of Discourse. A custom feature must be enabled for it to work at all, and the attacker’s payload must pass the CSP to be executed. However, if an attacker succeeds in embedding Javascript that does pass the CSP, it could result in session hijacking for any users that view the attacker’s post. The vulnerability is patched in the latest tests-passed, beta and stable branches. Users are advised to upgrade. Users unable to upgrade should enable and/or restore your site's CSP to the default one provided with Discourse. Remove any embed-able hosts configured.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
Discourse 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse存在跨站脚本漏洞，该漏洞源于允许嵌入通过 CSP 的 Javascript，导致用户会话劫持。受影响的产品和版本：Discourse stable 3.0.2及之前版本，beta 3.1.0.beta3及之前版本，tests-passed 3.1.0.beta3及之前版本。
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

VendorProductAffected VersionsCPESubscribe
discoursediscourse stable: < 3.0.3 -

II. Public POCs for CVE-2023-29196

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III. Intelligence Information for CVE-2023-29196

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Same Patch Batch · discourse · 2023-04-18 · 4 CVEs total

CVE-2023-305385.4 MEDIUMStored Cross-site Scripting via improper sanitization of svg files in Discourse
CVE-2023-306064.2 MEDIUMMultisite denial of service through unsanitized dynamic dispatch to SiteSetting in Discour
CVE-2023-284402.7 LOWDenial of service via admin theme import route in Discourse

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-29196

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