CVE-2023-43658
Improper escaping of event titles could lead to Cross-site Scripting (XSS) within the 'email preview' UI when a site has CSP disabled.
Does this matter?
Lower severity and a low EPSS score (0.50%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.50% probability · 41th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- discourse/discourse calendar
- Source
- security-advisories@github.com
References
- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSPThird Party Advisory
- https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644dePatch
- https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6Vendor Advisory
- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSPThird Party Advisory
- https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644dePatch
- https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.