EUVD-2026-92590
GHSA-52qx-gr3f-hfqm
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable and unauthenticated (AV:N/PR:N), but AC:H because reliable impact depends on a usable POP gadget chain; high C/I/A when exploitation succeeds.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
2DescriptionCVE.org
Deserialization of Untrusted Data vulnerability in Liquid Web / StellarWP Advanced Post Manager advanced-post-manager allows Object Injection.This issue affects Advanced Post Manager: from n/a through 4.5.5.
Articles & Coverage 2
AnalysisAI
Object injection in the WordPress plugin Advanced Post Manager (all releases through version 4.5.5) lets remote attackers push attacker-controlled serialized data into PHP's unserialize() routine, potentially instantiating arbitrary objects and, where a usable POP gadget chain exists, achieving code execution with full confidentiality, integrity and availability impact. The NVD vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, 9.8) treats the flaw as unauthenticated and network-reachable, whereas our independent assessment raises attack complexity to High because real-world impact hinges on a reachable gadget chain in the plugin, WordPress core or another active plugin; no public exploit identified at time of analysis and there is no CISA KEV entry for this CVE.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires reaching the Advanced Post Manager input that deserializes attacker-controlled data via unserialize(); per the NVD vector (PR:N/UI:N) no authentication or user interaction is claimed, affecting all versions from the earliest through 4.5.5. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | All provided signals point to high severity: the NVD CVSS 3.1 vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, 9.8) describes a network-reachable, low-complexity, unauthenticated flaw with full confidentiality, integrity, and availability impact, consistent with CWE-502 PHP Object Injection. … 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 patch identified at time of analysis, so the immediate priority is to deactivate and, if unused, delete the Advanced Post Manager plugin from all WordPress installations; if the plugin is business-critical, isolate the site behind authentication or IP allowlisting at the reverse proxy so the deserialization path cannot be reached by untrusted clients, accepting that this breaks public-facing functionality that relies on the plugin. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every WordPress instance running Advanced Post Manager at or below version 4.5.5, confirm which are internet-facing, and where the plugin is not business-essential deactivate and remove it immediately; where removal is not possible, restrict administrative and plugin-related endpoints to trusted IP ranges, apply virtual patching or WAF rules that block serialized object payloads targeting the plugin, and enable verbose logging and file-integrity monitoring on affected hosts. …
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External POC / Exploit Code
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