EUVD-2026-60791
GHSA-22r5-47c6-39f8
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated and remote (PR:N/AV:N) per the description, but AC:H because meaningful impact requires a usable POP gadget chain to be present in the runtime; impacts high when a chain exists.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
3DescriptionCVE.org
Unauthenticated PHP Object Injection in Ultimate Maps by Supsystic < 1.5.0 versions.
AnalysisAI
Unauthenticated PHP Object Injection in the Ultimate Maps by Supsystic WordPress plugin (all versions before 1.5.0) lets remote attackers pass attacker-controlled serialized data into a PHP unserialize() call, instantiating arbitrary PHP objects. If a usable POP (property-oriented programming) gadget chain is present in the plugin, WordPress core, or any other active plugin, this can escalate to remote code execution, file operations, or database compromise. Reported by Patchstack and assigned CVSS 9.8; there is no public exploit identified at time of analysis and it is not listed in CISA KEV.
Technical ContextAI
The root cause is CWE-502 (Deserialization of Untrusted Data). PHP's unserialize() reconstructs objects from a serialized string; when that string is attacker-controlled, magic methods such as __wakeup(), __destruct(), or __toString() fire during or after object reconstruction. On their own these instantiations are inert, but chained through 'gadget' classes already loaded in the WordPress runtime they can be steered into file writes/reads, SQL execution, or arbitrary code execution. The affected component is the Ultimate Maps by Supsystic plugin (CPE cpe:2.3:a:supsystic:ultimate_maps_by_supsystic:*:*:*:*:*:*:*:*), a WordPress mapping plugin; the flaw exists because a request-supplied value reaches unserialize() without authentication or sanitization. The practical severity of any PHP object injection depends heavily on gadget-chain availability in the specific site's plugin/theme stack.
RemediationAI
Vendor-released patch: update Ultimate Maps by Supsystic to version 1.5.0 or later, which remediates the deserialization flaw; this is the primary and recommended action. If immediate patching is not possible, apply compensating controls: deactivate and remove the plugin until it can be updated (side effect: map features on the site break), or place a WAF/virtual-patch rule in front of the site to block requests containing PHP-serialized object markers (e.g. patterns like 'O:' / 'a:' in the vulnerable parameter - side effect: possible false positives on legitimate serialized payloads). Also audit for and remove unnecessary plugins/themes to shrink the pool of available POP gadget chains, and restrict access to the plugin's request endpoints where feasible. Reference the advisory for confirmation: https://patchstack.com/database/wordpress/plugin/ultimate-maps-by-supsystic/vulnerability/wordpress-ultimate-maps-by-supsystic-plugin-1-5-0-php-object-injection-vulnerability
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
Leaving vuln.today