CVE-2026-85679Network attack vector

Unauthenticated stored XSS via global-styles block keys

Published Oct 1, 2026 · Updated Oct 1, 2026

Stored XSS in Extendify 3.1.6 and earlier allows remote attackers to plant scripts through WordPress global-styles requests. The registerIncoming() handler processes the styles.blocks block-type key before WordPress checks the route's permission callback, without adequate input sanitization or output escaping. An unauthenticated POST, PUT, or PATCH request to that route can store a script that executes when a user opens the affected page.

CVSS severity7.2
High
EPSS probability0.31%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Extendify 3.1.6 and earlier allows remote attackers to plant scripts through WordPress global-styles requests. The registerIncoming() handler processes the styles.blocks block-type key before WordPress checks the route's permission callback, without adequate input sanitization or output escaping. An unauthenticated POST, PUT, or PATCH request to that route can store a script that executes when a user opens the affected page.

The record

CVE
CVE-2026-85679
Published
Oct 1, 2026
Updated
Oct 1, 2026
Vendor
Extendify
Product
Extendify
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Extendify · Extendifyversion=0 <=3.1.6

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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