CVE-2026-65904

mediumCVSS 4.7covered by 1 sourcefirst seen 2026-07-23

DOMPurify through 3.3.3 fails to sanitize DOM elements passed via IN_PLACE mode when the element originates from a different window/realm (e.g., an iframe's contentDocument). A cross-realm instanceof check in the private _isNode() function returns false for foreign-realm nodes, causing DOMPurify to stringify the element (yielding '[object HTMLDivElement]'), silently reset IN_PLACE to false, and return the unsanitized element unchanged with any XSS payloads intact.

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Exploitation outlook

Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-65904: DOMPurify through 3.3.3 fails to sanitize DOM elements passed via IN_PLACE mode when the eleme…nvd · 2026-07-23

External references

NVD record for CVE-2026-65904

CVE.org record

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