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CVE-2021-43792— Notifications leak in Discourse

Quick assessment

Affected
discourse discourse
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.

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 存在安全漏洞，该漏洞源于标签组只能允许特定的组(如员工)查看特定的标签。通过偏好标签跟踪或监视标签的用户，如果他们的员工状态被撤销，仍然会看到与该标签相关的通知，但不会看到每个主题上的标签。漏洞会影响使用“标签仅对以下组可见”特性的标签组的用户。

CVSS 4.3 · Medium EPSS 0.83% · P55

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell
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I. Basic Information for CVE-2021-43792

Vulnerability Information
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Vulnerability Title
Notifications leak in Discourse
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source discussion platform. In affected versions a vulnerability affects users of tag groups who use the "Tags are visible only to the following groups" feature. A tag group may only allow a certain group (e.g. staff) to view certain tags. Users who were tracking or watching the tags via /preferences/tags, then have their staff status revoked will still see notifications related to the tag, but will not see the tag on each topic. This issue has been patched in stable version 2.7.11. Users are advised to upgrade as soon as possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 安全漏洞
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 存在安全漏洞，该漏洞源于标签组只能允许特定的组(如员工)查看特定的标签。通过偏好标签跟踪或监视标签的用户，如果他们的员工状态被撤销，仍然会看到与该标签相关的通知，但不会看到每个主题上的标签。漏洞会影响使用“标签仅对以下组可见”特性的标签组的用户。
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
discourse discourse stable < 2.7.11 -

II. Public POCs for CVE-2021-43792

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III. Intelligence Information for CVE-2021-43792

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Patches & Fixes for CVE-2021-43792 (1)

Vendor Advisories for CVE-2021-43792 (1)

Other References for CVE-2021-43792 (1)

Same Patch Batch · discourse · 2021-12-01 · 3 CVEs total

CVE-2021-43794 5.3 MEDIUM Anonymous user cache poisoning via development-mode header in Discourse
CVE-2021-43793 4.3 MEDIUM Bypass of Poll voting limits in Discourse

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-200

V. Comments for CVE-2021-43792

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