CVE-2026-83492Network attack vector

Authenticated persistent site crash via unvalidated theme name

Published Aug 31, 2026 · Updated Aug 31, 2026

Denial of service in Extend Themes Kubio AI Page Builder before 2.9.1 allows remote authenticated users to crash WordPress sites. The enable-theme REST handler passes the client-supplied name directly to switch_theme(), allowing an array to corrupt the stored stylesheet and template options. High-privileged access to the endpoint is required; the malformed options reload on every request, keeping the entire site unavailable.

CVSS severity6.9
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Extend Themes Kubio AI Page Builder before 2.9.1 allows remote authenticated users to crash WordPress sites. The enable-theme REST handler passes the client-supplied name directly to switch_theme(), allowing an array to corrupt the stored stylesheet and template options. High-privileged access to the endpoint is required; the malformed options reload on every request, keeping the entire site unavailable.

The record

CVE
CVE-2026-83492
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
Extend Themes
Product
Kubio AI Page Builder
Classifications
CWE-20, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 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 <2.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Extend Themes · Kubio AI Page Builderversion=0 <2.9.1

Published CVSS scores

6.9Tenable CNACVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.9Tenable Research AdvisoryCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
6.1Tenable Research AdvisoryCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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