Seraphinite Accelerator <= 2.29.18 - Reflected Cross-Site Scripting
Summary
| CVE | CVE-2026-17532 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-05 08:16:32 UTC |
| Updated | 2026-08-12 21:00:37 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 6.1 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.003470000 probability, percentile 0.276220000 (date 2026-08-14)
Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 6.1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| 3.1 | CNA | DECLARED | 6.1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
ChangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Seraphinitesoft | Seraphinite Accelerator | affected 2.29.18 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/cache_ex.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/cache.php | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/5aeea62b-bd6c-4fe2-8c0f-8c991... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/common.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache_ex.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/common.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Alireza (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-07-27T09:10:46.000Z | Vendor Notified |
| CNA | 2026-08-04T18:25:00.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.