Master Blocks 1.4.1 - 1.4.1.4 - Unauthenticated Stored XSS via White Label Settings (CVE-2026-88824) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-88824

Master Blocks 1.4.1 - 1.4.1.4 - Unauthenticated Stored XSS via White Label Settings

Answer in brief

CVE-2026-88824 records a Unknown severity vulnerability in Master Blocks 1.4.1 - 1.4.1.4 - Unauthenticated Stored XSS via White Label Settings. The current sources do not mark it as known exploited. The current feed maps Unknown/Master Blocks (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 19, 2026Updated Sep 19, 2026Source checked Sep 19, 2026First seen by HOL Sep 19, 2026Material review Sep 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Master Blocks (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Master Blocksgeneric	>=1.4.1 <1.5.0	1.5.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Master Blocks.
Review the reported fix. Update Unknown/Master Blocks to 1.5.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 19, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source description

The Master Blocks WordPress plugin before 1.5.0 does not have authorisation on one of its REST routes, allowing unauthenticated users to update its settings, including a value that is output unescaped in the admin area, leading to Stored XSS that executes in the session of any administrator visiting a wp-admin page.

Quoted source text, attributed separately from HOL analysis.