CVE-2026-17532
Received Received - Intake

Reflected XSS in Seraphinite Accelerator WordPress Plugin

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: Wordfence

Description
The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'seraph_accel_prep' parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP's loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded 'nonce' value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled 'selfTest' field directly into the HTML response body. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-17532
EUVD
EUVD-2026-53175

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
seraphinite accelerator to 2.29.15 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The Seraphinite Accelerator WordPress plugin has a reflected Cross-Site Scripting (XSS) vulnerability in versions up to 2.29.15. It occurs because the plugin uses a weak comparison method (!=) for HMAC validation, allowing attackers to bypass security checks by sending a boolean true value. Additionally, improper output escaping in the HTML response allows injection of malicious scripts via the 'seraph_accel_prep' parameter.

Detection Guidance

This vulnerability can be detected by checking if the Seraphinite Accelerator plugin for WordPress is installed and if its version is up to and including 2.29.15. Inspect the plugin files for the CacheExtractPreparePageParams() function and the _CbContentFinishSkip() function to see if they handle the 'seraph_accel_prep' parameter and 'selfTest' field insecurely.

Impact Analysis

An attacker could trick you into clicking a malicious link, executing arbitrary scripts in your browser. This could lead to session hijacking, data theft, or unauthorized actions on your WordPress site. The attack requires user interaction but does not need authentication.

Compliance Impact

This XSS vulnerability could expose user data, violating GDPR's integrity and confidentiality requirements. For HIPAA, it may compromise protected health information integrity. Both standards mandate protection against unauthorized data access or modification.

Mitigation Strategies

Immediately update the Seraphinite Accelerator plugin to the latest version beyond 2.29.15. If an update is not available, consider disabling or removing the plugin until a patch is released. Additionally, implement input validation and output escaping for the 'seraph_accel_prep' parameter and 'selfTest' field in the plugin code.

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