Yoast SEO <= 26.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'yoast-schema' Block Attribute

2026-02-05 22:18

suyoung kim(AhnLab)

Strategic Overview

Status

Patched in 26.9

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

Affected Version<= 26.8

CVSS6.4Medium

CVECVE-2026-1293

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

Vulnerability Overview

The Yoast SEO – Advanced SEO with real-time guidance and built-in AI plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the `yoast-schema` block attribute in all versions up to, and including, 26.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Technical Analysis

REMEDIATION: Update to version 26.9, 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-2026-1293 https://www.wordfence.com/threat-intel/vulnerabilities/id/8b2e7c2d-ed2f-439b-9cee-f2e5d46121b6

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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