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CVE Record

CVE-2026-1499: WP Duplicate <= 1.1.8 - Authenticated (Subscriber+) Arbitrary File Upload via 'process_add_site' AJAX Action

The WP Duplicate plugin for WordPress is vulnerable to Missing Authorization leading to Arbitrary File Upload in all versions up to and including 1.1.8. This is due to a missing capability check on the `process_add_site()` AJAX action combined with path traversal in the file upload functionality. This makes it possible for authenticated (subscriber-level) attackers to set the internal `prod_key_random_id` option, which can then be used by an unauthenticated attacker to bypass authentication checks and write arbitrary files to the server via the `handle_upload_single_big_file()` function, ultimately leading to remote code execution.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-1499 affects the WP Duplicate / local-sync WordPress migration plugin. A low-privileged logged-in user can abuse missing authorization and upload handling weaknesses to enable arbitrary file writes, potentially leading to full site compromise. Treat exposed WordPress sites using versions up to 1.1.8 as high priority.

Executive priority

Prioritize within the next remediation cycle, faster for public-facing or high-value WordPress sites. Successful exploitation could give attackers control of the website and underlying files. If a confirmed fixed version is unavailable, disabling the plugin is the safest interim control.

Technical view

The issue combines a missing capability check in the process_add_site AJAX action with path traversal in upload handling. Sources describe subscriber-level attackers setting prod_key_random_id, after which unauthenticated requests may bypass checks and write arbitrary files through handle_upload_single_big_file, enabling remote code execution. CVSS is 8.8, network exploitable, low complexity, privileges required.

Likely exposure

WordPress sites with the WP Duplicate / local-sync plugin installed at versions up to and including 1.1.8. Exposure is higher where public registration or many subscriber-level accounts exist. The source bundle does not confirm a safe fixed version.

Exploitation context

No active exploitation is indicated by KEV, and the provided sources do not claim exploitation in the wild. Exploitation requires at least subscriber-level access for the initial authorization bypass, but the described chain can later involve unauthenticated file writes.

Researcher notes

Evidence is strongest for the vulnerable code paths and CVSS impact. The bundle references plugin source lines and a repository changeset, but does not clearly identify a fixed version or vendor advisory text. Avoid assuming exploitation in the wild without additional evidence.

Mitigation direction

  • Inventory WordPress sites for the WP Duplicate / local-sync plugin and version.
  • Disable the plugin where business impact allows until vendor guidance is confirmed.
  • Check the WordPress plugin repository and vendor advisories for a fixed release.
  • Restrict or review subscriber-level accounts on affected WordPress sites.
  • Monitor web roots and upload directories for unexpected executable files.

Validation and detection

  • Confirm whether the plugin is installed and active on each WordPress site.
  • Record installed plugin version and compare against versions up to 1.1.8.
  • Review WordPress user roles, especially subscriber accounts and public registration settings.
  • Inspect web server and WordPress logs for unusual AJAX and upload activity.
  • Check file integrity for unexpected new or modified server-side scripts.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-862: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-1499 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
9Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2026-1499Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
revmakxWP Duplicate – WordPress Migration Plugin0unaffected
Weakness

CWE details

CWE-862

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-862 · source CWE mapping

Missing Authorization

Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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