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CVE-2024-45303— Discourse Calendar plugin event names susceptible to XSS

Quick assessment

Affected
discourse discourse-calendar
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 Calendar是Discourse开源的一个日历插件。 Discourse Calendar 0.5之前版本存在跨站脚本漏洞，该漏洞源于动态日历功能存在问题，事件名称渲染时可能受到XSS攻击。此漏洞仅影响那些修改或禁用了Discourse默认内容安全策略的站点。

CVSS 6.1 · Medium EPSS 0.26% · P17
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I. Basic Information for CVE-2024-45303

Vulnerability Information
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Vulnerability Title
Discourse Calendar plugin event names susceptible to XSS
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse Calendar plugin adds the ability to create a dynamic calendar in the first post of a topic to Discourse. Rendering event names can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse’s default Content Security Policy. The issue is patched in version 0.5 of the Discourse Calendar plugin.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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
Discourse Calendar 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse Calendar是Discourse开源的一个日历插件。 Discourse Calendar 0.5之前版本存在跨站脚本漏洞，该漏洞源于动态日历功能存在问题，事件名称渲染时可能受到XSS攻击。此漏洞仅影响那些修改或禁用了Discourse默认内容安全策略的站点。
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-calendar < 0.5 -

II. Public POCs for CVE-2024-45303

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III. Intelligence Information for CVE-2024-45303

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IV. Related Vulnerabilities

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