CVE-2023-43658

Improper escaping of user input in discourse-calendar

Severity Score

6.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

dicourse-calendar is a plugin for the Discourse messaging platform which adds the ability to create a dynamic calendar in the first post of a topic. Improper escaping of event titles could lead to Cross-site Scripting (XSS) within the 'email preview' UI when a site has CSP disabled. Having CSP disabled is a non-default configuration, so the vast majority of sites are unaffected. This problem is resolved in the latest version of the discourse-calendar plugin. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.

dicourse-calendar es un complemento para la plataforma de mensajería Discourse que agrega la capacidad de crear un calendario dinámico en la primera publicación de un tema. El escape inadecuado de los títulos de los eventos podría provocar Cross-Site Scripting (XSS) dentro de la interfaz de usuario de "email preview" cuando un sitio tiene CSP deshabilitado. Tener CSP deshabilitado es una configuración no predeterminada, por lo que la gran mayoría de los sitios no se ven afectados. Este problema se resuelve en la última versión del complemento de calendario de discourse. Se recomienda a los usuarios que actualicen. Los usuarios que no puedan actualizar deben asegurarse de que CSP esté habilitado en el foro.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2023-09-20 CVE Reserved
2023-10-16 CVE Published
2024-09-16 CVE Updated
2024-11-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

References (3)

URL	Tag	Source
https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644de	2023-10-20

URL	Date	SRC
https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6	2023-10-20

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Discourse Search vendor "Discourse"		Discourse Calendar Search vendor "Discourse" for product "Discourse Calendar"				<= 2023-10-16 Search vendor "Discourse" for product "Discourse Calendar" and version " <= 2023-10-16"		discourse		Affected