WordPress Core < 5.3.1 - Stored Cross-Site Scripting via Block Editor

2019-12-13 00:00

Nguyen Van Khanh

Strategic Overview

Status

Patched in 3.7.32

Affected CoreWordPress 5.3

Affected Version3.7 – 5.3 · 18 branches

CVSS5.8Medium

CVECVE-2019-16780

View all WordPress 5.3 vulnerabilities

Vulnerability Overview

WordPress users with lower privileges (like contributors) can inject JavaScript code in the block editor using a specific payload, which is executed within the dashboard. This can lead to XSS if an admin opens the post in the editor. Execution of this attack does require an authenticated user. This has been patched in WordPress 5.3.1, along with all the previous WordPress versions from 3.7 to 5.3 via a minor release. Automatic updates are enabled by default for minor releases and we strongly recommend that you keep them enabled.

Technical Analysis

REMEDIATION: Update to one of the following versions, or a newer patched version: 3.7.32, 3.8.32, 3.9.30, 4.0.29, 4.1.29, 4.2.26, 4.3.22, 4.4.21, 4.5.20, 4.6.17, 4.7.16, 4.8.12, 4.9.13, 5.0.8, 5.1.4, 5.2.5, 5.3.1 --- IDENTIFIER: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

External References

https://www.cve.org/CVERecord?id=CVE-2019-16780 https://www.wordfence.com/threat-intel/vulnerabilities/id/78b98f21-ac0c-496b-8cb9-8d2f3bd751b1

CVSS Vector

5.8

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N

Base

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredLow
User InteractionRequired
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone

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