The Appointment Booking Calendar Plugin and Scheduling Plugin WordPress plugin before 1.6.3 does not verify the amount actually paid against the… (CVE-2026-76586)
Description
The Appointment Booking Calendar Plugin and Scheduling Plugin for WordPress versions before 1.6.3 contain a vulnerability where the plugin does not verify the amount actually paid against the server-side price when confirming an online payment. This allows unauthenticated users to have a paid appointment approved for less than the correct price.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-76586 affects the Appointment Booking Calendar Plugin and Scheduling Plugin for WordPress prior to version 1.6.3. The vulnerability arises because the plugin fails to verify that the payment amount matches the server-side price for a booking during payment confirmation. This flaw enables unauthenticated attackers to bypass payment validation and have appointments approved for a fraction of the intended price.
Potential Impact
An attacker can exploit this vulnerability to obtain paid appointments without paying the full price, leading to financial loss for the service provider. The integrity of the payment process is compromised, but there is no direct impact on confidentiality or availability.
Mitigation Recommendations
Upgrade the Appointment Booking Calendar Plugin and Scheduling Plugin to version 1.6.3 or later, where this issue is fixed. No other mitigation guidance is provided. Patch status is not explicitly stated but the version 1.6.3 is indicated as the fixed version, so updating to this version or later is recommended.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-h9qm-hc3c-qpr3
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-76586"]
Threat ID: 6a92f7d4acd9273b49e75939
Added to database: 08/29/2026, 15:16:36 UTC
Last enriched: 09/08/2026, 02:37:23 UTC
Last updated: 10/13/2026, 06:48:19 UTC
Views: 23
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.