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CVE-2026-64638

Quick assessment

Affected
WordPress WordPress
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress是美国基金会开源的一款一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。 WordPress 7.0.3之前版本存在跨站脚本漏洞，该漏洞源于登录屏幕存在反射型跨站脚本漏洞，在特定条件下可能升级为远程代码执行。

CVSS 8.9 · High EPSS 0.89% · P58

Public Exploits 1

Nuclei · 1 CVE-2026-64638.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
WordPress WordPress < 7.0.3 unaffected
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I. Basic Information for CVE-2026-64638

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
WordPress is vulnerable to a pre-auth reflected XSS vulnerability on the login screen. Via a specially crafted malicious third-party website hosted by an attacker, it is possible for this to be escalated to an RCE vulnerability with conditions outside of the attackers control. This requires successful social engineering of and explicit interaction by the target victim. This issue affects all versions of WordPress. Version 7.0.3 has been released, containing a fix for the vulnerability, and as a courtesy to users on older branches the fix has been backported to all branches back to 4.7. Discovered and responsibly disclosed by [the team at pwn.ai](https://pwn.ai/).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress是美国基金会开源的一款一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。 WordPress 7.0.3之前版本存在跨站脚本漏洞，该漏洞源于登录屏幕存在反射型跨站脚本漏洞，在特定条件下可能升级为远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WordPress WordPress 0 ~ 7.0.3 -

II. Public POCs for CVE-2026-64638

# POC Description Source Link Shenlong Link
1 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. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-64638.yaml POC Details
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III. Intelligence Information for CVE-2026-64638

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Vendor Pages for CVE-2026-64638 (1)

IV. Related Vulnerabilities

Same product: WordPress
Same vendor: WordPress
Same weakness: CWE-79

V. Comments for CVE-2026-64638

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