Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| backdropcms | backdrop | 1.28.0 – < 1.28.5, 1.29.0 – < 1.29.3 | 1.28.5 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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rhburt/CVE-2025-25062 ★ 2 · Dec 14, 2024
Backdrop CMS 1.29.2 - Privilege Escalation via Stored XSS + CSRF
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.