Cross-site Scripting in Backdrop CMS
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | backdrop/backdrop | < 1.24.2 | 1.24.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
backdrop/backdrop- Disclosed
- 24.04.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-3862-c622-v4fp - CC BY 4.0
Vulnerability history: backdrop/backdrop
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 10.2022 11.2025
- Without a fix
- 6
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 7
Disclosures per year
- 2022: 5
- 2023: 1
- 2024: 1
- 2025: 1
- 2026: 0
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Cross-site Scripting in Backdrop CMS this entry
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