EUVD-2026-87891
GHSA-ggx5-r53p-pf97
Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Network-reachable low-complexity feature, but requires an admin-delegated custom capability so PR:H; impacts are bounded (secret read, option overwrite) at C:L/I:L/A:L absent a confirmed RCE gadget chain.
Primary rating from Vendor (WPScan).
CVSS VectorVendor: WPScan
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Authenticated users who hold a specifically delegated booking-management capability in the Online Scheduling and Appointment Booking System WordPress plugin (versions 23.2 through 28.3) can chain an unsafe PHP deserialization flaw with a broken access control check on a privileged maintenance routine to inject arbitrary PHP objects, overwrite privileged site options, and read stored integration secrets. The plugin does not restrict that maintenance feature to administrators and does not prevent deserialization of untrusted input, so any account granted this custom capability - which an administrator must explicitly assign, a non-default delegated privilege - can reach the vulnerable path; no end-user interaction is required (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L, score 4.7). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated WordPress account that has been granted a custom booking-management capability which an administrator must explicitly assign - this is a non-default, delegated privilege, not a standard subscriber or self-registered role. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals converge on genuine-but-low real-world priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade the Online Scheduling and Appointment Booking System plugin to version 28.3 or later, which remediates both the deserialization sink and the missing administrator-only restriction on the maintenance feature; the fix is documented via the WPScan advisory at https://wpscan.com/vulnerability/2150717e-7564-4b29-b2e7-362dd3b480c3/ and the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-86841. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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