CVE-2026-6723: CWE-863 Incorrect Authorization in croixhaug Simply Schedule Appointments
Description
The Simply Schedule Appointments Booking Plugin for WordPress up to version 1.6.11.11 contains an incorrect authorization vulnerability. This flaw allows unauthenticated attackers to modify admin-controlled fields via the appointment update REST API endpoint. Exploitation can lead to unauthorized changes such as faking payment confirmation, reassigning appointments to other users, and altering service types.
CVSS v3.1
Score 5.3medium
Affected software
croixhaug
Simply Schedule Appointments
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6723 is an incorrect authorization vulnerability (CWE-863) in the Simply Schedule Appointments Booking Plugin for WordPress. The vulnerability exists because the appointment update REST API endpoint does not properly restrict which fields token-authenticated customers can modify. As a result, unauthenticated attackers can manipulate sensitive appointment data, including payment status, user assignment, and service type. This affects all plugin versions from 0 up to and including 1.6.11.11.
Potential Impact
The vulnerability allows attackers without authentication to modify administrative fields on appointments. This can lead to integrity issues such as falsifying payment confirmations, unauthorized reassignment of appointments, and unauthorized changes to service types. There is no impact on confidentiality or availability reported. The CVSS v3.1 base score is 5.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, no user interaction, and impact limited to integrity.
Mitigation Recommendations
No official patch or fix is currently documented for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the REST API endpoint if possible and monitor for suspicious activity related to appointment modifications.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-04-20T19:51:21.160Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac9c0302cdf04f65604542b
Added to database: 10/10/2026, 04:33:52 UTC
Last enriched: 10/10/2026, 04:49:34 UTC
Last updated: 10/10/2026, 04:49:34 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.