Vulnerability · Published Aug 7, 2026 · Assigned by hackerone
CVE-2026-64638
High 8.9
In plain English
A high-severity cross-site scripting in WordPress from WordPress. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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/).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | wordpress | no fix listed | DEBIAN-CVE-2026-64638 |
| Debian:13 | wordpress | 6.8.7+dfsg1-0+deb13u1 | DEBIAN-CVE-2026-64638 |
| Debian:14 | wordpress | 7.0.3+dfsg1-1 | DEBIAN-CVE-2026-64638 |
| Ubuntu:22.04:LTS | wordpress | no fix listed | UBUNTU-CVE-2026-64638 |
| Ubuntu:24.04:LTS | wordpress | no fix listed | UBUNTU-CVE-2026-64638 |
| Ubuntu:26.04:LTS | wordpress | no fix listed | UBUNTU-CVE-2026-64638 |
| Ubuntu:26.10 | wordpress | no fix listed | UBUNTU-CVE-2026-64638 |
Affected products (as reported)
Weakness: CWE-79 · Vector: 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