Medium severity · published Oct 16, 2023
CVE-2023-43658
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
6.1
CVSS
0.6%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DC
Discourse Calendar · Discourse
through 2023-10-16 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-43658
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-43658
Third Party Advisory
https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
Patch
https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644de
Vendor Advisory
https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6
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