Preliminary research
CVE-2026-41238: How Prototype Pollution Turns DOMPurify Into an XSS Gadget
AI-collected research leads through 22 September 2026, including targeted additions between broader sweeps. Unranked, incomplete, not community-vetted, and subject to change.
Explains a DOMPurify custom-element gadget caused by replacing normalized configuration with an ordinary fallback object. The source-level case traces inherited allowlist options and RegExp type requirements, illustrating how default allocations can undo earlier configuration hardening.
Record
- Researcher
- Paul Reed
- Published by
- trace37
- Date
- Topic
- XSS
In the archive
Related sources
- DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback Advisory
- DOMPurify prototype fallback advisory Advisory
- DOMPurify evolutionary fuzzer, part 1
Tags
This page is the archive's own catalogue record. The research is the work of Paul Reed, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on .