The Divi theme for WordPress is vulnerable to Stored Cross-Site Scripting via the Dynamic Content feature's legacy JSON format in all versions up to, and including, 4.27.6. This is due to two compounding flaws: (1) the save-time sanitization filter etbuildersanitizedynamiccontentfields() only searches for dynamic content markers in the @ET-DC@...@ format, but the rendering engine also supports a legacy JSON format that is silently converted at render time, completely bypassing the save-time filter, and (2) the postmetakey resolver in etbuilderfilterresolvedefaultdynamiccontent() does not apply wpksespost() to the resolved meta value when enablehtml is set to on, passing raw getpostmeta() output directly to the page. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.