low
3.5
CWE
79 80
Advisory Published
Updated

CVE-2020-4049: Authenticated self-XSS via theme uploads in WordPress

First published: Fri Jun 12 2020(Updated: )

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Credit: security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
debian/wordpress
5.0.15+dfsg1-0+deb10u1
5.0.19+dfsg1-0+deb10u1
5.7.8+dfsg1-0+deb11u2
6.1.1+dfsg1-1
6.3.1+dfsg1-1
WordPress WordPress>=3.7<3.7.34
WordPress WordPress>=3.8<3.8.34
WordPress WordPress>=3.9<3.9.32
WordPress WordPress>=4.0<4.0.31
WordPress WordPress>=4.1<4.1.31
WordPress WordPress>=4.2<4.2.28
WordPress WordPress>=4.3<4.3.24
WordPress WordPress>=4.4<4.4.23
WordPress WordPress>=4.5<4.5.22
WordPress WordPress>=4.6<4.6.19
WordPress WordPress>=4.7<4.7.18
WordPress WordPress>=4.8<4.8.14
WordPress WordPress>=4.9<4.9.15
WordPress WordPress>=5.0<5.0.10
WordPress WordPress>=5.1<5.1.6
WordPress WordPress>=5.2<5.2.7
WordPress WordPress>=5.3.0<5.3.4
WordPress WordPress>=5.4<5.4.2
Fedoraproject Fedora=31
Fedoraproject Fedora=32
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0

Remedy

https://github.com/WordPress/wordpress-develop/commit/404f397b4012fd9d382e55bf7d206c1317f01148

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Reference Links

Frequently Asked Questions

  • What is the vulnerability ID for this WordPress vulnerability?

    The vulnerability ID for this WordPress vulnerability is CVE-2020-4049.

  • What is the severity level of CVE-2020-4049?

    CVE-2020-4049 has a severity level of low.

  • How can this vulnerability be exploited?

    This vulnerability can be exploited by crafting the name of a theme folder in a way that could lead to JavaScript execution on the themes page in /wp-admin.

  • Who can exploit this vulnerability?

    An admin with the ability to upload themes can exploit this vulnerability.

  • How can I fix CVE-2020-4049?

    To fix CVE-2020-4049, update to WordPress version 5.4.2 or later.

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