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CVE-2026-57692 – Unauthenticated Privilege Escalation – LCweb PrivateContent Plugin ≤ 9.9.2

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Summary

CVE-2026-57692 is a critical Incorrect Privilege Assignment vulnerability (CWE-266) in the LCweb PrivateContent WordPress plugin, affecting all versions through 9.9.2. An unauthenticated remote attacker can exploit a flaw in the plugin’s user private page preview system to escalate privileges on the target WordPress installation, with no credentials or user interaction required. The vulnerability carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: Incorrect privilege assignment within the plugin’s user private page preview system — the component responsible for rendering user-level-restricted content previews in PrivateContent’s standalone membership database fails to enforce proper authorization checks, allowing privilege levels to be assigned or assumed without authentication.
  • Trigger conditions: The flaw is remotely exploitable over the network with no authentication and no user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Attack vector: An unauthenticated attacker sends a crafted network request targeting the vulnerable preview system endpoint, obtaining elevated privileges within the PrivateContent user management layer — potentially escalating to administrative access over the WordPress site.
  • Impact: Successful exploitation results in full compromise of confidentiality, integrity, and availability (C:H/I:H/A:H), including unauthorized access to restricted content, modification of site data, and potential full site takeover.

Affected software

  • LCweb PrivateContent (premium WordPress membership plugin): all versions from n/a through 9.9.2

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the PrivateContent plugin to version 9.10.0 or later. The vendor released v9.10.0 on July 1, 2026, explicitly addressing the security flaw in the user private page preview system.
  • If immediate patching is not feasible: Restrict internet-facing access to WordPress admin and plugin endpoints via firewall or web application firewall (WAF) rules, and disable the plugin’s user private page preview feature until the patch is applied.
  • Audit user accounts and privilege levels in the PrivateContent user database for any unauthorized modifications that may indicate prior exploitation.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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