CVE-2026-88824Network attack vector

Administrator-session script execution via unescaped white-label setting

Published Sep 19, 2026 · Updated Sep 19, 2026

Stored XSS in Jewel Theme Master Blocks 1.4.1 through 1.4.1.4 allows remote attackers to run script in an administrator's session. An unauthenticated settings REST route stores a white-label value without authorization or sanitization, and wp-admin renders it without escaping. Execution requires an administrator to visit a wp-admin page, where the stored payload runs with that administrator's browser-session authority.

CVSS severity8.8
High
EPSS probability0.51%
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 Jewel Theme Master Blocks 1.4.1 through 1.4.1.4 allows remote attackers to run script in an administrator's session. An unauthenticated settings REST route stores a white-label value without authorization or sanitization, and wp-admin renders it without escaping. Execution requires an administrator to visit a wp-admin page, where the stored payload runs with that administrator's browser-session authority.

The record

CVE
CVE-2026-88824
Published
Sep 19, 2026
Updated
Sep 19, 2026
Vendor
Jewel Theme
Product
Master Blocks
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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=1.4.1 <1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jewel Theme · Master Blocksversion=1.4.1 <1.5.0

Published CVSS scores

8.8CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A: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.

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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