XSS in Backdropcms Backdrop
CVE-2025-25062
An XSS issue was discovered in Backdrop CMS 1.28.x before 1.28.5 and 1.29.x before 1.29.3. It doesn't sufficiently isolate long text content when the CKEditor 5 rich text editor is used. This allows a potential attacker to craft specialized HTML and JavaScript that may be executed when an administrator attempts to edit a piece of content. This vulnerability is mitigated by the fact that an attacker must have the ability to create long text content (such as through the node or comment forms) and an administrator must edit (not view) the content that contains the malicious content. This problem only exists when using the CKEditor 5 module.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.017 (76.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Backdropcms Backdrop — versions 1.28.0, 1.29.0
- Backdropcms Backdrop_cms
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Vendor Advisory)
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-25062?
- CVE-2025-25062 is a medium-severity vulnerability in Backdropcms Backdrop, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2025-02-03.
- How severe is CVE-2025-25062?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2025-25062 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.