CVE-2026-74916

WP Fastest Cache – WordPress Cache Plugin 0.8.7.7 - 1.5.0 - Unauthenticated Cache Poisoning

2026-08-26 00:00
Amity Gilmour

Strategic Overview

Status
Patched in 1.5.1
Affected Plugin
WP Fastest Cache – WordPress Cache Plugin
Affected Version
0.8.7.7 – 1.5.0
CVSS
6.1Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-74916
View all WP Fastest Cache – WordPress Cache Plugin vulnerabilities

At a glance

CVE-2026-74916 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WP Fastest Cache WordPress plugin, affecting versions 0.8.7.7 – 1.5.0. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.5.1; sites on affected versions should update now. Disclosed August 2026, reported by Amity Gilmour.

Vulnerability Overview

The WP Fastest Cache – WordPress Cache Plugin plugin for WordPress is vulnerable to Cache Poisoning in versions 0.8.7.7 through 1.5.0. This is due to missing exclusion of requests with query strings from the page cache, allowing cache entries for clean URLs to be overwritten by requests carrying arbitrary query parameters. This makes it possible for unauthenticated attackers to poison the page cache by requesting a URL with tracking query parameters, causing their rendered page context to be stored and served to every subsequent visitor of the clean URL.

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 privileges on the target site.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in WP Fastest Cache 0.8.7.7 – 1.5.0 takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For WP Fastest Cache the fix is 1.5.1: builds 0.8.7.7 – 1.5.0 are affected, anything from 1.5.1 onward is not.

Remediation

Update to version 1.5.1, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WP Fastest Cache 1.5.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-74916https://www.wordfence.com/threat-intel/vulnerabilities/id/dd203abf-689e-44d3-9194-dba60f1ca4b2https://nvd.nist.gov/vuln/detail/CVE-2026-74916

Related records

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