Unsafe Deserialization in Online Scheduling and Appointment Booking System (WordPress plugin) (CVE-2026-86841)
Summary
Vulnerability in Online Scheduling and Appointment Booking System (WordPress plugin) (CVE-2026-86841). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
The Online Scheduling and Appointment Booking System WordPress plugin before 28.3 does not prevent deserialization of untrusted input and does not correctly restrict a privileged maintenance feature to administrators, allowing users granted a custom booking-management capability, which an administrator must explicitly assign, to inject arbitrary PHP objects, overwrite privileged site options, and read stored integration secrets.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-86841 has been found in Online Scheduling and Appointment Booking System (WordPress plugin).
Risk of unauthorized operations or information disclosure. CVSS score: 4.7/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Online Scheduling and Appointment Booking System (WordPress plugin) CVE-2026-86841" on the vendor's site.
CVE-2026-86841 (Online Scheduling and Appointment Booking System (WordPress plugin)) — CWE-502 / CVSS v3 4.7
Attack vector: remote (network-reachable) / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Unsafe deserialization (CWE-502) exists in Online Scheduling and Appointment Booking System (WordPress plugin).
Check the vendor advisory for the affected versions of Online Scheduling and Appointment Booking System (WordPress plugin).
Severity: Medium (CVSS 4.7/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Online Scheduling and Appointment Booking System (WordPress plugin) を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- web contact@wpscan.com
- web nvd.nist.gov
- web wpscan.com
- web github.com