UBUNTU-CVE-2026-64638

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Source
https://ubuntu.com/security/CVE-2026-64638
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64638.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-64638
Upstream
  • CVE-2026-64638
Published
2026-08-07T18:17:00Z
Modified
2026-08-13T03:01:00Z
Severity
  • 8.9 (High) CVSS_V4 - 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 CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:16.04:LTS
wordpress

Package

Name
wordpress
Purl
pkg:deb/ubuntu/wordpress?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.3+dfsg-1
4.3.1+dfsg-1
4.4+dfsg-1
4.4.1+dfsg-1
4.4.2+dfsg-1
4.4.2+dfsg-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wordpress",
            "binary_version": "4.4.2+dfsg-1ubuntu1"
        },
        {
            "binary_name": "wordpress-l10n",
            "binary_version": "4.4.2+dfsg-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentyfifteen",
            "binary_version": "4.4.2+dfsg-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentyfourteen",
            "binary_version": "4.4.2+dfsg-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentysixteen",
            "binary_version": "4.4.2+dfsg-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64638.json"
Ubuntu:18.04:LTS
wordpress

Package

Name
wordpress
Purl
pkg:deb/ubuntu/wordpress?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.8.2+dfsg-2
4.8.3+dfsg-1
4.9.1+dfsg-1
4.9.2+dfsg-1
4.9.4+dfsg-1
4.9.5+dfsg1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wordpress",
            "binary_version": "4.9.5+dfsg1-1"
        },
        {
            "binary_name": "wordpress-l10n",
            "binary_version": "4.9.5+dfsg1-1"
        },
        {
            "binary_name": "wordpress-theme-twentyfifteen",
            "binary_version": "4.9.5+dfsg1-1"
        },
        {
            "binary_name": "wordpress-theme-twentyseventeen",
            "binary_version": "4.9.5+dfsg1-1"
        },
        {
            "binary_name": "wordpress-theme-twentysixteen",
            "binary_version": "4.9.5+dfsg1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64638.json"
Ubuntu:20.04:LTS
wordpress

Package

Name
wordpress
Purl
pkg:deb/ubuntu/wordpress?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.2.2+dfsg1-1
5.2.4+dfsg1-1
5.3.2+dfsg1-1
5.3.2+dfsg1-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wordpress",
            "binary_version": "5.3.2+dfsg1-1ubuntu1"
        },
        {
            "binary_name": "wordpress-l10n",
            "binary_version": "5.3.2+dfsg1-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentynineteen",
            "binary_version": "5.3.2+dfsg1-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentyseventeen",
            "binary_version": "5.3.2+dfsg1-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentysixteen",
            "binary_version": "5.3.2+dfsg1-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64638.json"
Ubuntu:22.04:LTS
wordpress

Package

Name
wordpress
Purl
pkg:deb/ubuntu/wordpress?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.7.1+dfsg1-2ubuntu1
5.8.1+dfsg1-2ubuntu1
5.8.2+dfsg1-1ubuntu1
5.8.3+dfsg1-1ubuntu1
5.8.3+dfsg1-1ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wordpress",
            "binary_version": "5.8.3+dfsg1-1ubuntu1.1"
        },
        {
            "binary_name": "wordpress-l10n",
            "binary_version": "5.8.3+dfsg1-1ubuntu1.1"
        },
        {
            "binary_name": "wordpress-theme-twentynineteen",
            "binary_version": "5.8.3+dfsg1-1ubuntu1.1"
        },
        {
            "binary_name": "wordpress-theme-twentytwenty",
            "binary_version": "5.8.3+dfsg1-1ubuntu1.1"
        },
        {
            "binary_name": "wordpress-theme-twentytwentyone",
            "binary_version": "5.8.3+dfsg1-1ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64638.json"
Ubuntu:24.04:LTS
wordpress

Package

Name
wordpress
Purl
pkg:deb/ubuntu/wordpress?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

6.*
6.2+dfsg1-1ubuntu1
6.4.3+dfsg1-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wordpress",
            "binary_version": "6.4.3+dfsg1-1ubuntu1"
        },
        {
            "binary_name": "wordpress-l10n",
            "binary_version": "6.4.3+dfsg1-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentytwentyfour",
            "binary_version": "6.4.3+dfsg1-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentytwentythree",
            "binary_version": "6.4.3+dfsg1-1ubuntu1"
        },
        {
            "binary_name": "wordpress-theme-twentytwentytwo",
            "binary_version": "6.4.3+dfsg1-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64638.json"
Ubuntu:26.04:LTS
wordpress

Package

Name
wordpress
Purl
pkg:deb/ubuntu/wordpress?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

6.*
6.7.2+dfsg1-1.1ubuntu1
6.7.2+dfsg1-1.1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wordpress",
            "binary_version": "6.7.2+dfsg1-1.1ubuntu2"
        },
        {
            "binary_name": "wordpress-l10n",
            "binary_version": "6.7.2+dfsg1-1.1ubuntu2"
        },
        {
            "binary_name": "wordpress-theme-twentytwentyfive",
            "binary_version": "6.7.2+dfsg1-1.1ubuntu2"
        },
        {
            "binary_name": "wordpress-theme-twentytwentyfour",
            "binary_version": "6.7.2+dfsg1-1.1ubuntu2"
        },
        {
            "binary_name": "wordpress-theme-twentytwentythree",
            "binary_version": "6.7.2+dfsg1-1.1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64638.json"