EUVD-2026-66943
GHSA-3h99-6f5g-6j4m
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network-reachable deserialization with no user interaction gives AV:N/AC:L/PR:N/UI:N; PHP object injection with a viable gadget chain justifies full C/I/A:H, though real impact depends on gadget availability.
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 Geo Controller <= 8.9.8 versions.
Articles & Coverage 1
AnalysisAI
PHP Object Injection in the Geo Controller WordPress plugin (the plugin distributed as cf-geoplugin) affects all versions up to and including 8.9.8, allowing unauthenticated remote attackers to inject crafted serialized PHP objects that are deserialized by the application. Because exploitation requires no authentication and the CVSS vector reports full confidentiality, integrity, and availability impact, a suitable gadget chain in the plugin or wider WordPress environment could lead to remote code execution, data disclosure, or site takeover. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the Geo Controller (cf-geoplugin) plugin at version 8.9.8 or earlier is installed and active on the target WordPress site, and that the attacker can reach the request parameter the plugin passes to PHP deserialization - per the CVSS vector this is remotely reachable with no authentication and no user interaction (AV:N/PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 9.8 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H), meaning network-reachable, low-complexity, and unauthenticated - the profile that typically warrants prompt remediation. … 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 Geo Controller endpoint with a malicious serialized PHP object in a parameter that the plugin passes to unserialize(). If a compatible gadget chain is available in the WordPress stack, the deserialization triggers magic methods that lead to file writes or code execution, giving the attacker control over the site. … |
| Remediation | Upgrade to a fixed release above 8.9.8 once published; the input data does not include an exact patched version number, so confirm the fixed version directly against the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/cf-geoplugin/vulnerability/wordpress-geo-controller-plugin-8-9-8-php-object-injection-vulnerability) or the plugin's changelog before deploying. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all WordPress installations for cf-geoplugin versions 8.9.8 and earlier, and prepare immediate disable procedures. …
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External POC / Exploit Code
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