CVE-2026-64638
HighWordPress is vulnerable to a pre-auth reflected XSS vulnerability on the login screen.
Published Aug 7, 2026 · Updated Sep 3, 2026 · Also known as 278da117-fe04-45d6-86d4-e71fe6536032, DEBIAN-CVE-2026-64638, EUVD-2026-54565, UBUNTU-CVE-2026-64638
Key Facts
Patch in the next maintenance window- CVE-2026-64638 is a high-severity vulnerability (CVSS 8.9 v4) affecting WordPress (debian).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 0.9% probability of exploitation in the next 30 days.
- Fixed versions are available, including WordPress 4.7.34, WordPress 6.8.7+dfsg1-0+deb13u1, WordPress 7.0.3+dfsg1-1.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
CVSS v4
8.9
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
EPSS (30-day exploit likelihood)
0.9%
Higher than 58.7% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2026-64638 brief as a PDF
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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.
Affected Products
19 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WordPressdebian | >= 4.7.0 | 6.8.7+dfsg1-0+deb13u1 |
Patched Releases
WordPress
4.7.34, 6.8.7+dfsg1-0+deb13u1, 7.0.3+dfsg1-1
Timeline
Publicly disclosed
Aug 7, 2026
Last updated
Sep 3, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryhttps://github.com/WordPress/wordpress-develop/security/advisories/GHSA-52p2-r8wf-jcrf
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2026-64638
- advisoryhttps://ubuntu.com/security/CVE-2026-64638
- advisoryhttps://wpscan.com/vulnerability/162fa8ab-4d80-46f8-9a15-63c8dfd0be33/
- advisoryhttps://wpscan.com/vulnerability/1b6c5935-c8e0-4b9b-9ba6-0f16a0e2cdae/
FAQ
Common Questions.
WordPress is vulnerable to a pre-auth reflected XSS vulnerability on the login screen.
Affected: WordPress (debian) versions >= 4.7.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including WordPress 4.7.34, WordPress 6.8.7+dfsg1-0+deb13u1, WordPress 7.0.3+dfsg1-1.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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