What is CVE-2026-86838?

CVE-2026-86838 is a medium-severity vulnerability in Bookly, classified under CWE-472 EXTERNAL CONTROL OF ASSUMED-IMMUTABLE WEB PARAMETER. CVSS score: 5.3/10. Published 2026-09-28.

How severe is CVE-2026-86838?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Bookly

CVE-2026-86838

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.

Published 2026-09-28.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Bookly

References

wpscan.com/vulnerability/1c8a53e7-5556-4dcb-a461-c6df253d0b7a/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-86838?: CVE-2026-86838 is a medium-severity vulnerability in Bookly, classified under CWE-472 EXTERNAL CONTROL OF ASSUMED-IMMUTABLE WEB PARAMETER. CVSS score: 5.3/10. Published 2026-09-28.
How severe is CVE-2026-86838?: Medium severity. CVSS v3 base score is 5.3 out of 10.