CVE-2026-17532
MediumSeraphinite Accelerator <= 2.29.18 - Reflected Cross-Site Scripting
Published Aug 4, 2026 · Updated Aug 12, 2026 · Also known as 5aeea62b-bd6c-4fe2-8c0f-8c9919688e87
Key Facts
Routine patching- CVE-2026-17532 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Seraphinite Accelerator (wordpress-plugin).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 0.8% probability of exploitation in the next 30 days.
- Fixed versions are available, including Seraphinite Accelerator 2.29.19.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
CVSS v3.1
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
0.8%
Higher than 55.5% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2026-17532 brief as a PDF
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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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Seraphinite Acceleratorwordpress-plugin | See advisory | 2.29.19 |
Patched Releases
Seraphinite Accelerator
2.29.19
Timeline
Publicly disclosed
Aug 4, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/5aeea62b-bd6c-4fe2-8c0f-8c9919688e87?source=api-prod
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/5aeea62b-bd6c-4fe2-8c0f-8c9919688e87?source=api-scan
- otherhttps://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache_ex.php#L838
- otherhttps://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache.php#L76
- otherhttps://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/common.php#L6036
FAQ
Common Questions.
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.
Affected: Seraphinite Accelerator (wordpress-plugin). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Seraphinite Accelerator 2.29.19.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
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