Packagist · craftcms/cms
Craft CMS: Stored XSS in the control panel via unescaped draft name
The control-panel helper that renders element chip/card labels writes an element's draftName into the page without HTML-encoding it, while the surrounding path segments are encoded.
A low-privilege control-panel user who can create a draft of an element (for example, an entry) controls the draft name, so they can store an XSS payload that executes in the browser of any other control-panel user who is shown that element’s chip or card (element indexes with drafts visible, relation and element-selection fields that reference the element, and the drafts list).
This allows a low-privilege author to run JavaScript in an administrator’s authenticated session and take over the control panel. It is the same output-encoding class as the recently fixed GHSA-xrqc-p465-2xvg (Structure entry title) and GHSA-3x4w-mxpf-fhqq (revision context menu), which encoded other user-controlled titles but not the draft name.
A low-privilege author can run arbitrary JavaScript in the session of any higher-privileged control-panel user who is shown the element’s chip or card, including administrators. This is a cross-privilege stored XSS, not a self-XSS: the attacker and the victim are different users, and the payload fires during routine browsing of element indexes and relation fields.
Because the script runs in the victim’s control-panel origin, it can read the CSRF token that Craft embeds in the page JavaScript (Craft.csrfTokenValue, confirmed present on control-panel pages) and issue authenticated control-panel actions as the victim. This was verified end-to-end on Craft Pro: an in-session request to the users/save-user action created a brand new account (User saved., HTTP 200), an admin-only capability that an author can never perform directly.
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Check my repoSources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.