PT-2023-28904 · Discourse · Discourse Calendar

Pmusaraj · Published 2023-10-16 · Updated 2023-10-20 · CVE-2023-43658

Positive Technologies (AI Summary)

CVSS v3.1

8.0

High

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions discourse-calendar (affected versions not specified)

Description The discourse-calendar plugin for the Discourse messaging platform is affected by an issue where improper escaping of event titles could lead to Cross-site Scripting (XSS) within the 'email preview' UI when a site has CSP disabled. This is a non-default configuration, so the vast majority of sites are unaffected.

Recommendations To resolve the issue, users are advised to upgrade to the latest version of the discourse-calendar plugin. If an upgrade is not possible, users should ensure CSP is enabled on the forum as a temporary workaround.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2023-43658

GHSA-3FWJ-F6WW-7HR6

Affected Products

Discourse Calendar

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43658.json · Exploit
• https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644de · Patch
• https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-43658 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-43658 · Security Note
• https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP · Note
• https://t.me/cibsecurity/72388 · Telegram Post
• https://twitter.com/cracbot/status/1714396852056121392 · Twitter Post
• https://t.me/cvenotify/59550 · Telegram Post
• https://twitter.com/CVEnew/status/1714032990181822903 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1714079716561301681 · Twitter Post