CVE-2026-87966CWE-639

CVE-2026-87966

Medium · published September 18, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
21.9
In the wild
Unconfirmed
What it is

The Easy Appointments WordPress plugin before 4.0.2.2 does not perform an ownership or authorization check on its unauthenticated appointment-reservation endpoint before updating an existing appointment identified by a request-supplied id, allowing unauthenticated attackers to overwrite, and through a follow-on cleanup delete, arbitrary appointments.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00304 · 21.9th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-09-18T10:16Z
References (1)
https://wpscan.com/vulnerability/e2e625f4-c146-4622-b439-3179c4484613/ · [email protected]
EPSS history
Timeline
  • 19 SEP 03:54Z
    EPSS moved — → 0%
    epss
  • 18 SEP 06:00Z
    Easy Appointments 4.0 - 4.0.2.1 - Unauthenticated Arbitrary Appointment Modification and Deletion via IDOR
    cvelistv5