EUVD-2026-65172
GHSA-9prr-67qp-hf9r
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network object injection (AV:N/PR:N/UI:N), but AC:H because successful high impact depends on a reachable POP gadget chain that is not guaranteed on every install.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Unauthenticated PHP Object Injection in The Events Calendar <= 6.17.2 versions.
Articles & Coverage 1
AnalysisAI
PHP Object Injection in the WordPress plugin The Events Calendar (all versions up to and including 6.17.2) allows unauthenticated remote attackers to inject crafted serialized PHP objects that are deserialized by the plugin, per CVSS a network, low-complexity, no-authentication issue with high confidentiality, integrity, and availability impact (CVSS 9.8). Depending on the POP gadget chains present in the plugin, its dependencies, or other installed plugins/themes, this can escalate to arbitrary file operations, SQL injection, or remote code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that attacker-supplied data reaches the plugin's unserialize() call (the object-injection entry point) and that a usable POP gadget chain is present in the plugin, WordPress core, or another installed plugin/theme to convert object instantiation into a concrete malicious action - object injection alone is inert without a reachable gadget. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderately consistent but incomplete. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker sends a crafted HTTP request to a public plugin endpoint containing a serialized PHP object payload built from a POP gadget chain. The plugin deserializes the input, triggering magic methods that lead to file writes, SQL injection, or code execution in the WordPress context. … |
| Remediation | Upgrade The Events Calendar to the vendor's patched release above 6.17.2 as published on the plugin's WordPress.org page and referenced in the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/the-events-calendar/vulnerability/wordpress-the-events-calendar-plugin-6-17-2-php-object-injection-vulnerability); the exact fixed version is not stated in the available data and should be confirmed from the changelog before deployment. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all WordPress installations running The Events Calendar version 6.17.2 or earlier, document affected site locations, and disable the plugin on non-production or lower-risk sites that have event management alternatives. …
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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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