Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key (CVE-2026-17520) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-17520

Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key

Answer in brief

CVE-2026-17520 records a Unknown severity vulnerability in Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key. The current sources do not mark it as known exploited. The current feed maps Unknown/Newsletters (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 29, 2026Updated Aug 29, 2026Source checked Aug 29, 2026First seen by HOL Aug 29, 2026Material review Aug 29, 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/Newsletters (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Newslettersgeneric	>=0 <4.17	4.17

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Newsletters.
Review the reported fix. Update Unknown/Newsletters to 4.17 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 29, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source description

The Newsletters WordPress plugin before 4.17 does not generate its API key using a sufficiently random source, deriving it from a publicly known value, allowing unauthenticated attackers to compute the key and perform privileged actions such as adding and deleting subscribers and sending emails, when the optional API has been enabled.

Quoted source text, attributed separately from HOL analysis.