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CVE-2025-15689 – Unauthenticated Privilege Escalation – Capella WordPress Theme ≤ 2.5.5

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Summary

CVE-2025-15689 is a critical, unauthenticated privilege escalation vulnerability affecting the Capella WordPress theme (developed by ThemeGoods), rated CVSS 9.8. The flaw is classified as CWE-266 (Incorrect Privilege Assignment) and allows unauthenticated attackers to escalate their access level on affected sites without any user interaction. As of publication, no patched version of the theme has been publicly confirmed.

Technical details

  • Root cause: incorrect privilege assignment (CWE-266) within the Capella theme’s code, which allows an unauthenticated actor to obtain elevated privileges on the WordPress site.
  • Trigger conditions: no authentication, prior access, or user interaction is required to exploit the flaw.
  • Attack vector: network-based (AV:N), with low attack complexity (AC:L).
  • Impact: full compromise of confidentiality, integrity, and availability (C:H/I:H/A:H), consistent with an attacker gaining administrative-level control of the affected WordPress site.

Affected software

  • ThemeGoods Capella WordPress Theme, versions up to and including 2.5.5.

Severity

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

Mitigation and recommended actions

  • Immediate: Check for an updated release of the Capella theme beyond version 2.5.5 and apply it as soon as it becomes available; no confirmed patched version has been publicly identified at this time.
  • If no patch is available: Restrict or disable public access to the theme’s privilege-related functionality where possible, monitor sites for unexpected new administrator or elevated-privilege accounts, and consider taking the site offline or placing it behind additional access controls (e.g., a WAF rule blocking anonymous requests to privilege-management endpoints) until a fix is released.

References

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