Extendify <= 3.1.6 - Unauthenticated Stored Cross-Site Scripting via 'styles.blocks' Block Type Key
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Extendify plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'styles.blocks' Block Type Key in all versions up to, and including, 3.1.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is possible because registerIncoming() is hooked on rest_request_before_callbacks and runs before WordPress evaluates the route's permission_callback, meaning any unauthenticated POST, PUT, or PATCH request to a /wp/v2/global-styles route can trigger the vulnerable code path.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-85679
- 2026-10-03 Alias added: GHSA-xx9f-33qf-3g5j
- 2026-10-03 CISA SSVC decision points changed
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/38024680-2d99-4af0-b805-6fd718a1d338?source=cve
- https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/BlockStyleVariations.php#L62
- https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/BlockStyleVariations.php#L75
- https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/BlockStyleVariations.php#L29
- https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/BlockStyleVariations.php#L37
- https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/bootstrap.php#L112
- https://plugins.trac.wordpress.org/changeset?reponame=&new=3688833%40extendify%2Ftags%2F3.2.0&old=3669317%40extendify%2Ftags%2F3.1.6
- https://plugins.trac.wordpress.org/changeset/3688833/extendify/trunk/app/Shared/Services/BlockStyleVariations.php
More extendify vulnerabilities
- TI-2021-06831 EditorsKit < 1.31.6 - Contributor+ Arbitrary PHP Code Execution CVSS 3.1HIGH 8.8
- TI-2023-06081 EditorsKit <= 1.40.3 - Authenticated (Administrator+) Arbitrary File Upload CVSS 3.1HIGH 7.2
Sources
- CVE-2026-85679 · CVE Program
- CVE-2026-85679 · NVD
- FIRST EPSS
- GHSA-xx9f-33qf-3g5j · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences