What’s Vulnerable › Vulnerabilities

CVE-2023-31045

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-04-24 · updated 2026-06-17
• Weakness: CWE-79

Description

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: before 1.24.2 — fixed in 1.24.2

How to fix

Upgrade to a fixed version: BackdropCMS Backdrop 1.24.2. Check the vendor advisory for mitigations.

References

• https://github.com/backdrop/backdrop-issues/issues/6065
• https://github.com/backdrop/backdrop/releases/tag/1.24.2
• https://github.com/backdrop/backdrop-issues/issues/6065
• https://github.com/backdrop/backdrop/releases/tag/1.24.2

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