EUVD-2026-39382
GHSA-h5wm-8hx6-m9ff
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable with low complexity and no interaction; requires a Subscriber account (PR:L); object injection can yield full C/I/A impact via gadget chains, scope unchanged.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionCVE.org
Subscriber PHP Object Injection in EventPrime <= 4.3.4.1 versions.
Articles & Coverage 1
AnalysisAI
PHP Object Injection in the EventPrime event-calendar-management WordPress plugin (versions 4.3.4.1 and earlier) allows an authenticated attacker holding only a low-privilege Subscriber account to inject crafted serialized objects into an unsafe deserialization sink. Depending on the PHP gadget chains present in WordPress core, the plugin, or other installed plugins, this can escalate to data tampering, information disclosure, or remote code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a valid authenticated Subscriber-level account on the target WordPress site (CVSS PR:L) - exploitation is network-based with low complexity and no user interaction (AV:N/AC:L/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H = 8.8 High) indicates network-reachable, low-complexity exploitation requiring only low privileges and no user interaction, with high impact across confidentiality, integrity, and availability - consistent with object-injection bugs that can yield RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers (or compromises) a Subscriber account on a WordPress site running EventPrime <= 4.3.4.1, then submits a crafted request containing a malicious serialized PHP object to a vulnerable plugin endpoint. When the plugin deserializes the input, an available gadget chain is triggered, potentially allowing the attacker to read sensitive data, alter site content, or execute code. … |
| Remediation | Upgrade EventPrime to the latest available release above 4.3.4.1; the input data does not specify the exact patched version, so confirm the fixed build directly via the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/eventprime-event-calendar-management/vulnerability/wordpress-eventprime-plugin-4-3-4-1-php-object-injection-vulnerability) and the plugin's WordPress.org changelog before deploying. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Identify all WordPress instances running EventPrime ≤4.3.4.1; audit all Subscriber account access and privileges; prepare incident response procedures. …
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External POC / Exploit Code
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