CVE-2023-31045: Backdropcms Backdrop CMS

Medium severity, CVSS 4.8. EPSS: 0.5% chance of exploitation in the next 30 days.

A stored Cross-site scripting (XSS) issue in Text Editors and Formats in Backdrop CMS before 1.24.2 allows remote attackers to inject arbitrary web script or HTML via the name parameter. When a user is editing any content type (e.g., page, post, or card) as an admin, the stored XSS payload is executed upon selecting a malicious text formatting option. NOTE: the vendor disputes the security relevance of this finding because "any administrator that can configure a text format could easily allow Full HTML anywhere."

Affected products

• Backdropcms Backdrop CMS: before 1.24.2 (fixed in 1.24.2)

Published 2023-04-24. Last modified 2026-06-17.