EUVD-2026-85796
GHSA-j2rf-55r9-c5ph
Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable with only Subscriber auth (PR:L, UI:N); AC:H because high impact depends on an external gadget chain not shipped in the plugin; C/I/A:H reflect potential RCE when a chain exists.
Primary rating from Vendor (WPScan).
CVSS VectorVendor: WPScan
Lifecycle Timeline
7DescriptionCVE.org
The wpForo Forum WordPress plugin before 3.1.6 does not restrict which classes may be instantiated when it deserializes a user-supplied profile field value, allowing authenticated users with Subscriber-level access and above to inject a PHP Object. No POP chain is present in the wpForo Forum WordPress plugin before 3.1.6 itself; if one is present via another installed wpForo Forum WordPress plugin before 3.1.6 or , this could lead to remote code execution, arbitrary file operations, or SQL injection. This is an incomplete fix of CVE-2026-49769.
AnalysisAI
PHP object injection in the wpForo Forum WordPress plugin before 3.1.6 lets an authenticated attacker with Subscriber-level access or higher submit a crafted serialized value into a user-supplied profile field that the plugin deserializes without restricting which classes may be instantiated, as rated CVSS 7.5 (AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Because the plugin ships no POP/gadget chain of its own, escalation to remote code execution, arbitrary file operations, or SQL injection depends on a compatible chain being present via another installed plugin or theme - the factor driving the high attack complexity - and absent such a chain the outcome is limited to object injection with no confirmed high-severity effect. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated account at Subscriber level or above on a site running wpForo Forum before 3.1.6 (PR:L) - trivially met where open user registration is enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a serious-on-paper but conditionally-exploitable flaw. … 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 | Upgrade wpForo Forum to version 3.1.6 or later, which is the vendor-released fix that restricts the classes permitted during deserialization of profile field values; patch availability is 'available from vendor' and the change is an extension of the earlier CVE-2026-49769 remediation, so running any version below 3.1.6 - including ones patched only for the prior CVE - should be treated as still vulnerable. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every WordPress installation running wpForo Forum and record the exact installed version, flagging all instances below 3.1.6 as exposed and prioritizing internet-facing community, membership, and forum sites; on the highest-risk sites, temporarily restrict or disable open self-registration, review and prune dormant Subscriber-level accounts, and deploy edge/WAF filtering for serialized payloads in profile-update requests as an interim control. …
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External POC / Exploit Code
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