Yoast SEO <= 3.4.0 - Authenticated Stored Cross-Site Scripting

2016-08-02 00:00

Hammad Shamsi

Strategic Overview

Status

Patched in 3.4.1

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

Affected Version< 3.4.1

CVSS5.4Medium

CVECVE-2021-24153

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

Vulnerability Overview

A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin before 3.4.1, which had built-in blacklist filters which were blacklisting parentheses as well as several functions such as alert, but bypasses were found.

Technical Analysis

REMEDIATION: Update to version 3.4.1, 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-2021-24153 https://www.wordfence.com/threat-intel/vulnerabilities/id/0cde6b5b-f760-467b-940f-06a1f983ddc4

CVSS Vector

5.4

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

Base

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

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