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CVE-2026-76548 – Authentication Bypass / Unauthorized Content Disclosure & Modification – User Profi

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Summary

CVE-2026-76548 affects the User Profile Builder WordPress plugin (also distributed as "Profile Builder"), versions prior to 4.0.1. The plugin’s front-end file upload feature fails to properly restrict access, allowing unauthenticated visitors to perform actions normally reserved for privileged roles. The issue is rated High severity (CVSS 8.2) and is classified as CWE-287 (Improper Authentication).

Technical details

  • Root cause: the plugin’s front-end file upload functionality does not correctly enforce authentication/authorization checks before granting access to privileged capabilities.
  • Trigger condition: an unauthenticated visitor interacts with the front-end upload feature exposed by the plugin on a WordPress site where it is active.
  • Attack vector: Network — no authentication or user interaction is required to exploit the flaw.
  • Impact: unauthenticated attackers can list the site’s media library and modify unpublished posts, pages, and media items belonging to other users, resulting in unauthorized disclosure and integrity impact on site content.

Affected software

  • User Profile Builder (Profile Builder) WordPress plugin, versions 3.8.1 up to (but not including) 4.0.1.

Severity

  • CVSS v3.1 Base Score: 8.2 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Mitigation and recommended actions

  • Immediate: upgrade the User Profile Builder plugin to version 4.0.1 or later, which restricts the front-end upload feature from granting unauthorized access.
  • If patching cannot be applied immediately: disable or restrict access to the plugin’s front-end upload/registration forms until the update can be deployed, and monitor the media library and unpublished content for unexpected modifications.

How IONIX identifies potentially affected assets

IONIX matches the following signal against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw response body: /wp-content/plugins/profile-builder/

References

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1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

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3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Confirmation of verified exploitable assets
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