Yoast SEO <= 11.5 - Authenticated Stored Cross Site Scripting

2019-07-09 00:00

Sybre Waaijer

Strategic Overview

Status

Patched in 11.6-RC5

Affected PluginYoast SEO – Advanced SEO with real-time guidance and built-in AI

Affected Version<= 11.5

CVSS6.4Medium

CVECVE-2019-13478

View all Yoast SEO – Advanced SEO with real-time guidance and built-in AI vulnerabilities

Vulnerability Overview

The Yoast SEO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via term descriptions in versions up to, and including, 11.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with post editor access to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Technical Analysis

REMEDIATION: Update to version 11.6-RC5, or a newer patched version --- 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-2019-13478 https://www.wordfence.com/threat-intel/vulnerabilities/id/69b173ec-f7e9-4473-9b85-9a204a51cdf5

CVSS Vector

6.4

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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