CVE-2020-4049

Authenticated self-XSS via theme uploads in WordPress

Severity Score

2.4

*CVSS v3.1

Exploit Likelihood

5.3%

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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).

En las versiones afectadas de WordPress, cuando se cargan temas, el nombre de la carpeta temas puede ser diseñada en una manera que podría conllevar a una ejecución de JavaScript en /wp-admin en la página temas. Esto requiere un administrador para cargar el tema, y ??es un ataque de tipo self-XSS de baja gravedad. Esto ha sido parcheado en la versión 5.4.2, junto con todas las versiones afectadas anteriormente por medio de una versión menor (versiones 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)

Several vulnerabilities were discovered in Wordpress, a web blogging tool. They allowed remote attackers to perform various Cross-Side Scripting (XSS) attacks, create open redirects, escalate privileges, and bypass authorization access.

*Credits: Nrimo Ing Pandum

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-12-30 CVE Reserved
2020-06-10 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

CAPEC

References (8)

URL	Tag	Source
https://github.com/WordPress/wordpress-develop/security/advisories/GH...	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00000.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/09/msg00011.html	Mailing List

1 - 3 of 3

URL	Date	SRC

URL	Date	SRC
https://github.com/WordPress/wordpress-develop/commit/404f397b4012fd9d382e55bf7d...	2023-11-07

1 - 1 of 1

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message...	2023-11-07
https://wordpress.org/news/2020/06/wordpress-5-4-2-security-and-maintenance-release	2023-11-07
https://www.debian.org/security/2020/dsa-4709	2023-11-07

1 - 4 of 4

Affected Vendors, Products, and Versions (23)

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 3.7 < 3.7.34 Search vendor "Wordpress" for product "Wordpress" and version " >= 3.7 < 3.7.34"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 3.8 < 3.8.34 Search vendor "Wordpress" for product "Wordpress" and version " >= 3.8 < 3.8.34"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 3.9 < 3.9.32 Search vendor "Wordpress" for product "Wordpress" and version " >= 3.9 < 3.9.32"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 4.0 < 4.0.31 Search vendor "Wordpress" for product "Wordpress" and version " >= 4.0 < 4.0.31"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 4.1 < 4.1.31 Search vendor "Wordpress" for product "Wordpress" and version " >= 4.1 < 4.1.31"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 4.2 < 4.2.28 Search vendor "Wordpress" for product "Wordpress" and version " >= 4.2 < 4.2.28"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 4.3 < 4.3.24 Search vendor "Wordpress" for product "Wordpress" and version " >= 4.3 < 4.3.24"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 4.4 < 4.4.23 Search vendor "Wordpress" for product "Wordpress" and version " >= 4.4 < 4.4.23"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 4.5 < 4.5.22 Search vendor "Wordpress" for product "Wordpress" and version " >= 4.5 < 4.5.22"		-		Affected
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 4.6 < 4.6.19 Search vendor "Wordpress" for product "Wordpress" and version " >= 4.6 < 4.6.19"		-		Affected

1 - 10 of 23