ECS < 4.3.8 - Contributor+ Arbitrary Post Binding and Global Preset Modification via Dynamic Repeater Handlers (CVE-2026-18807) | HOL Guard CVE

Medium · CVSS 4.3CVE-2026-18807

ECS < 4.3.8 - Contributor+ Arbitrary Post Binding and Global Preset Modification via Dynamic Repeater Handlers

Answer in brief

CVE-2026-18807 records a Medium severity (CVSS 4.3) vulnerability in ECS < 4.3.8 - Contributor+ Arbitrary Post Binding and Global Preset Modification via Dynamic Repeater Handlers. The current sources do not mark it as known exploited. The current feed maps Unknown/ECS (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 Aug 15, 2026Updated Aug 26, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 4.3. 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/ECS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/ECSgeneric	>=0 <4.3.8	4.3.8

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/ECS.
Review the reported fix. Update Unknown/ECS to 4.3.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source description

The ECS WordPress plugin before 4.3.8 does not have capability or ownership checks on its dynamic repeater actions, relying only on a nonce available to any user who can open the page builder, allowing users with a contributor-level account or above to read, alter and delete the binding configuration of posts they do not own and to change the ECS WordPress plugin before 4.3.8's site-wide presets.

Quoted source text, attributed separately from HOL analysis.