CVE-2026-64638 Details.
WordPress Core < 7.0.3 - Preauth Reflected XSS (XSS2Shell)
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-64638. What It Means.
Pre-authentication reflected XSS in WordPress wp-login.php (CVE-2026-64638). The flaw exploits a parser differential between PHP strip_tags() and WordPress KSES. Tags with whitespace after < (e.g. "< area") survive strip_tags() but are normalized to valid HTML by KSES, leading to attacker-controlled DOM elements that trigger automatic JavaScript execution via user-profile.js. No user interaction required. Affects all WordPress versions < 7.0.3.
Affected Product. What Is Hit.
The record for CVE-2026-64638 does not name a vendor or product yet.
FAQ
Common Questions.
WordPress Core < 7.0.3 - Preauth Reflected XSS (XSS2Shell). Pre-authentication reflected XSS in WordPress wp-login.php (CVE-2026-64638). The flaw exploits a parser differential between PHP strip_tags() and WordPress KSES. Tags with whitespace after < (e.g. "< area") survive strip_tags() but are normalized to valid HTML by KSES, leading to attacker-controlled DOM elements that trigger automatic JavaScript execution via user-profile.js. No user interaction required. Affects all WordPress versions < 7.0.3.
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-64638 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-64638 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update the affected software to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-64638. Atlas does not run a check for it, so nothing here says whether a particular site is affected.