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CVE-2023-43658

Improper escaping of user input in discourse-calendar

Published: Oct 16, 2023Updated: Nov 21, 2024 Sources: CVE List NVDCWE-79
NVD MITRE
8.0CVSSHIGH
EPSS Score
0.5%
Top 61.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-79

Affected Products

discourse-calendardiscourseWeb & CMS Plugins
discourse calendardiscourseWeb & CMS Plugins
discoursecommercialUSWeb & CMS Pluginsaka discourse.org

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6
github.com
https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644de
github.com
https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
developer.mozilla.org

Timeline

Published
Oct 16, 2023
Last Updated
Nov 21, 2024

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