CVE-2023-43658

MEDIUM 6.1CVE-2023-43658 · Published 16/10/2023 · updated 17/06/2026

In short

CVE-2023-43658 is a MEDIUM (CVSS 6.1) vulnerability affecting discourse calendar (discourse).
Chance of exploitation in the next 30 days (EPSS): 0.59%, higher than 48.3% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
discourse calendar discourse	`≤ 2023-10-16`	No fix yet

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.

References

developer.mozilla.org/en-US/docs/Web/HTTP/CSP · Third Party Advisory
discourse/discourse-calendar commit 9788310 · Patch
discourse/discourse-calendar security advisory · Vendor Advisory

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Package

Affected versions

Patched versions

discourse calendar

discourse

≤ 2023-10-16

No fix yet

Description

More vulnerabilities in discourse calendar

See all →