Bookly < 28.3 - Unauthenticated Payment Bypass via Booking Price Manipulation (CVE-2026-86838) | HOL Guard CVE

Medium · CVSS 5.3CVE-2026-86838

Bookly < 28.3 - Unauthenticated Payment Bypass via Booking Price Manipulation

Answer in brief

CVE-2026-86838 records a Medium severity (CVSS 5.3) vulnerability in Bookly < 28.3 - Unauthenticated Payment Bypass via Booking Price Manipulation. The current sources do not mark it as known exploited. The current feed maps Unknown/Bookly (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 28, 2026Updated Sep 28, 2026Source checked Sep 28, 2026First seen by HOL Sep 28, 2026Material review Sep 28, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.3. 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/Bookly (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Booklygeneric	>=0 <28.3	28.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Bookly.
Review the reported fix. Update Unknown/Bookly to 28.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 28, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source description

The Bookly WordPress plugin before 28.3 does not validate client-supplied booking quantity values on the server before computing the appointment total, allowing unauthenticated users to reduce the total to zero and book paid services for free while bypassing the payment step.

Quoted source text, attributed separately from HOL analysis.