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CVE-2026-17532— Seraphinite Accelerator <= 2.29.18 - Reflected Cross-Site Scripting

Quick assessment

Affected
seraphinitesoft Seraphinite Accelerator
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Seraphinite Accelerator是WordPress基金会开源的一款能提高网站响应速度的插件。 WordPress Seraphinite Accelerator 2.29.15及之前版本存在跨站脚本漏洞，该漏洞源于'seraph_accel_prep'参数使用PHP松散比较运算符绕过HMAC签名检查，且_CbContentFinishSkip()函数输出转义不足，容易受到反射型跨站脚本攻击，可能导致未经身份验证的攻击者在页面中注入恶意脚本。

CVSS 6.1 · Medium EPSS 0.79% · P55

Public Exploits 1

Nuclei · 1 CVE-2026-17532.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
seraphinitesoft Seraphinite Accelerator ≤ 2.29.18 affected
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I. Basic Information for CVE-2026-17532

Vulnerability Information
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Vulnerability Title
Seraphinite Accelerator <= 2.29.18 - Reflected Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Seraphinite Accelerator 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Seraphinite Accelerator是WordPress基金会开源的一款能提高网站响应速度的插件。 WordPress Seraphinite Accelerator 2.29.15及之前版本存在跨站脚本漏洞，该漏洞源于'seraph_accel_prep'参数使用PHP松散比较运算符绕过HMAC签名检查，且_CbContentFinishSkip()函数输出转义不足，容易受到反射型跨站脚本攻击，可能导致未经身份验证的攻击者在页面中注入恶意脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
seraphinitesoft Seraphinite Accelerator 0 ~ 2.29.18 -

II. Public POCs for CVE-2026-17532

# POC Description Source Link Shenlong Link
1 The Seraphinite Accelerator plugin for WordPress up to and including 2.29.18 was vulnerable to reflected cross-site scripting through the seraph_accel_prep parameter. CacheExtractPreparePageParams() compared the expected HMAC against the JSON-decoded nonce with PHP's loose != operator, so a JSON boolean true satisfied the comparison and bypassed the signature check, and _CbContentFinishSkip() then concatenated the attacker-controlled selfTest field straight into the response body, letting unauthenticated attackers inject arbitrary scripts. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-17532.yaml POC Details
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III. Intelligence Information for CVE-2026-17532

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Patches & Fixes for CVE-2026-17532 (2)

Vendor Advisories for CVE-2026-17532 (1)

Vendor Pages for CVE-2026-17532 (1)

IV. Related Vulnerabilities

Same product: Seraphinite Accelerator
Same vendor: seraphinitesoft
Same weakness: CWE-79

V. Comments for CVE-2026-17532

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