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WordPress Patches Critical Core Vulnerability CVE-2026-87902 Affecting All Versions from 4.7.0

WordPress has released patches for a critical vulnerability in the platform's core code, tracked as CVE-2026-87902 with a CVSS score of 9.2. The flaw impacts every version from 4.7.0 through 7.1.1, meaning virtually all unpatched installations remain exposed. Because the issue resides in the base system rather than plugins or themes, even sites without any extensions installed are at risk. The vulnerability allows an unauthenticated attacker to load arbitrary PHP files from outside theme directories, which can lead to remote code execution on certain server configurations. The bug was privately reported in July by researcher Robert Ressl through HackerOne and disclosed publicly on 22 September, with no confirmed exploitation observed so far. Administrators are urged to apply the updates immediately and keep automatic updates enabled.

BoletimSecTranslated from Portuguese

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WordPress has issued security updates that address a critical vulnerability in the platform's core, identified as CVE-2026-87902 and rated CVSS 9.2. The flaw affects all versions from 4.7.0 to 7.1.1, leaving the vast majority of installations exposed until the latest patches are applied.

The vulnerability exists in the base code rather than in any plugin or theme. This means sites running a clean installation with no additional extensions are still at risk. An attacker can load a PHP file located outside the designated theme directories. Under specific server configurations, this capability can be leveraged to execute arbitrary code chosen by the attacker.

Exploitation requires no authentication and no interaction from any logged-in user, making the attack surface available to any visitor. The absence of required credentials significantly increases the severity of the issue.

Patch Releases

Security updates have been distributed across all currently supported branches:

  • 7.1.x → version 7.1.2
  • 7.0.x → version 7.0.6
  • 6.9.x → version 6.9.9
  • 6.8.x → version 6.8.10
  • 6.7.x → version 6.7.9
  • 6.6.x → version 6.6.9
  • Support extends back to 4.7.37

The vulnerability was reported in July by researcher Robert Ressl via a private disclosure on HackerOne and made public on 22 September. No evidence of active exploitation in the wild has been recorded to date.

Site owners are strongly advised to update immediately and ensure automatic updates remain enabled. For environments where immediate patching is not feasible, temporary mitigations include disabling register_argc_argv and removing unused PEAR components.

HackerOneCVE-2026-87902Robert Ressl
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