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Vulnerability · Published Jun 12, 2020 · Assigned by GitHub_M

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

Low 2.4

In plain English

A low-severity security flaw in wordpress-develop from WordPress. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.5% (higher than 85% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)2.4Low
Exploit odds (30 days)2.5%top 15.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12wordpress5.4.2+dfsg1-1DEBIAN-CVE-2020-4049
Debian:13wordpress5.4.2+dfsg1-1DEBIAN-CVE-2020-4049
Debian:14wordpress5.4.2+dfsg1-1DEBIAN-CVE-2020-4049
Ubuntu:22.04:LTSwordpressno fix listedUBUNTU-CVE-2020-4049

Affected products (as reported)

VendorProductVersions
WordPress wordpress-develop >= 5.4.0, < 5.4.2>= 5.3.0, < 5.3.4>= 5.2.0, < 5.2.7>= 5.1.0, < 5.1.6>= 5.0.0, < 5.0.10>= 4.9.0, < 4.9.15>= 4.8.0, < 4.8.14>= 4.7.0, < 4.7.18

Weakness: CWE-80 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N

References