CVE-2026-87828

Seraphinite Accelerator <= 2.29.23 - Authenticated (Subscriber+) Full Admin Area Denial of Service

2026-09-14 00:00
Ángel PS

Strategic Overview

Status
Patched in 2.29.24
Affected Plugin
Seraphinite Accelerator
Affected Version
<= 2.29.23
CVSS
4.3Medium
Weakness type
CWE-400 · Uncontrolled Resource Consumption
CVE
CVE-2026-87828
View all Seraphinite Accelerator vulnerabilities

At a glance

CVE-2026-87828 is a medium-severity Uncontrolled Resource Consumption vulnerability in the Seraphinite Accelerator WordPress plugin, affecting versions <= 2.29.23. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 2.29.24; sites on affected versions should update now. Disclosed September 2026, reported by Ángel PS.

Vulnerability Overview

The Seraphinite Accelerator plugin for WordPress is vulnerable to Denial of Service in all versions up to, and including, 2.29.23. This is due to a missing capability check on the OnAdminApi_StateSet AJAX handler, allowing low-privileged users to write malformed state values. This makes it possible for authenticated attackers, with subscriber-level access and above, to cause an uncaught error on every admin page load, rendering the entire WordPress admin area inaccessible to all administrators.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-400: Uncontrolled Resource Consumption

Reaching this weakness in Seraphinite Accelerator <= 2.29.23 takes an account at Subscriber level or above. Uncontrolled resource consumption means a request can make the server do an amount of work it never bounds, because the size or repetition of the job is taken from the request rather than capped by the code.

A single caller can hold PHP workers, database connections or disk open long enough to slow the site for everyone, without needing any account or any other flaw. For Seraphinite Accelerator the fix is 2.29.24: builds <= 2.29.23 are affected, anything from 2.29.24 onward is not.

Remediation

Update to version 2.29.24, or a newer patched version

How does WordSec protect against this?

An attacker needs Subscriber access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Seraphinite Accelerator 2.29.24 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-87828https://www.wordfence.com/threat-intel/vulnerabilities/id/515c5d34-19d8-4518-a127-35eb334be82chttps://nvd.nist.gov/vuln/detail/CVE-2026-87828

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C