XSS in Discourse Discourse-Calendar
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. 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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.005 (40.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Discourse Discourse-calendar — versions < 97883109
- Discourse Discourse_calendar
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2023-43658?
- CVE-2023-43658 is a high-severity vulnerability in Discourse Discourse-Calendar, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2023-10-16.
- How severe is CVE-2023-43658?
- High severity. CVSS v3 base score is 8.0 out of 10.