EUVD-2026-57959
GHSA-mc9r-rc7r-x444
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-reachable front-end input, no auth required, but user interaction needed to trigger deserialization; full CIA impact if POP chain available.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Unauthenticated PHP Object Injection in Booking Activities <= 1.18.4 versions.
AnalysisAI
PHP Object Injection in the Booking Activities WordPress plugin (versions ≤ 1.18.4) exposes sites to potential remote code execution through unsafe deserialization of attacker-controlled data. The CVSS vector (PR:N, UI:R) indicates exploitation requires no authentication but does require some form of user interaction, suggesting the attack surface likely involves a front-end booking form or link that a visitor triggers. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerability is triggered through a front-end booking interaction, meaning the attacker must be able to submit or deliver a serialized PHP payload via an input point handled by the Booking Activities plugin - no authentication is required (PR:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 8.8 (High) reflects a network-accessible, low-complexity attack requiring no privileges, though the UI:R component indicates some user interaction is necessary - limiting opportunistic mass exploitation compared to fully automated vectors. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious serialized PHP payload and embeds it in a parameter processed by the Booking Activities plugin - for example, within a booking form field or URL parameter visible to site visitors. When a user (or the attacker themselves, depending on the exact trigger mechanism) submits or accesses this input, the plugin deserializes it, instantiating attacker-controlled PHP objects. … |
| Remediation | The primary remediation is to upgrade Booking Activities to a version above 1.18.4. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all WordPress installations using Booking Activities plugin version 1.18.4 or earlier using automated scanning or WordPress admin console. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
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External POC / Exploit Code
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