EUVD-2026-63303
GHSA-mwfw-263q-69wc
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; C/I/A rated High assuming a reachable POP gadget chain enables RCE/data compromise.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
2DescriptionCVE.org
Unauthenticated PHP Object Injection in Flatastic <= 2.0 versions.
Articles & Coverage 1
AnalysisAI
PHP Object Injection in the Flatastic WordPress theme (versions 2.0 and earlier, by author monkeysan) lets unauthenticated remote attackers pass attacker-controlled serialized data into a PHP unserialize() call, potentially achieving remote code execution, data theft, or site takeover if a suitable POP gadget chain is present in the WordPress core, plugins, or theme. Reported by Patchstack and rated CVSS 9.8, it requires no authentication or user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the Flatastic theme (version <= 2.0) be installed and active, and that the attacker can reach the specific theme code path that passes untrusted input into unserialize(). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H = 9.8) marks this as network-reachable, low-complexity, and unauthenticated, which is the highest-priority profile for internet-facing WordPress sites. … 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 | No vendor-released patched version is confirmed in the provided data, so the exact fix version cannot be cited; monitor the Patchstack advisory (https://patchstack.com/database/wordpress/theme/flatastic/vulnerability/wordpress-flatastic-theme-2-0-php-object-injection-vulnerability) and the theme author for a release above 2.0 and upgrade as soon as it is published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: scan all WordPress installations to identify use of Flatastic theme versions 2.0 or earlier; immediately either uninstall the theme, disable it via admin panel, or temporarily place the site behind IP-based access restrictions. …
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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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