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Vulnerability · Published Apr 30, 2020 · Assigned by GitHub_M

CVE-2020-11026Specially crafted filenames in WordPress leading to XSS

High 8.7

In plain English

A high-severity security flaw 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 2.1% (higher than 82% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.7High
Exploit odds (30 days)2.1%top 18.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In affected versions of WordPress, files with a specially crafted name when uploaded to the Media section can lead to script execution upon accessing the file. This requires an authenticated user with privileges to upload files. This has been patched in version 5.4.1, along with all the previously affected versions via a minor release (5.3.3, 5.2.6, 5.1.5, 5.0.9, 4.9.14, 4.8.13, 4.7.17, 4.6.18, 4.5.21, 4.4.22, 4.3.23, 4.2.27, 4.1.30, 4.0.30, 3.9.31, 3.8.33, 3.7.33).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12wordpress5.4.1+dfsg1-1DEBIAN-CVE-2020-11026
Debian:13wordpress5.4.1+dfsg1-1DEBIAN-CVE-2020-11026
Debian:14wordpress5.4.1+dfsg1-1DEBIAN-CVE-2020-11026
Ubuntu:22.04:LTSwordpressno fix listedUBUNTU-CVE-2020-11026
Ubuntu:24.04:LTSwordpressno fix listedUBUNTU-CVE-2020-11026
Ubuntu:25.10wordpressno fix listedUBUNTU-CVE-2020-11026
Ubuntu:26.04:LTSwordpressno fix listedUBUNTU-CVE-2020-11026
Ubuntu:26.10wordpressno fix listedUBUNTU-CVE-2020-11026

Affected products (as reported)

VendorProductVersions
WordPress WordPress >= 5.4.0, < 5.4.1>= 5.3.0, < 5.3.3>= 5.2.0, < 5.2.6>= 5.1.0, < 5.1.5>= 5.0.0, < 5.0.9>= 4.9.0, < 4.9.14>= 4.8.0, < 4.8.13>= 4.7.0, < 4.7.17

Weakness: CWE-707 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

References