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This repository was archived by the owner on Jul 15, 2025. It is now read-only.

Improper escaping of user input can lead to XSS under non-default site configuration

High
pmusaraj published GHSA-3fwj-f6ww-7hr6 Oct 16, 2023

Package

discourse-calendar (Discourse)

Affected versions

<= 9d1726fe

Patched versions

> 9d1726fe

Description

Impact

Improper escaping of event titles could lead to 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.

Patches

This problem is resolved in the latest version of the discourse-calendar plugin

Workarounds

Ensure CSP is enabled on the forum.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVE ID

CVE-2023-43658

Weaknesses

No CWEs