Seraphinite Accelerator <= 2.29.18 - Reflected Cross-Site Scripting
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| seraphinitesoft | Seraphinite Accelerator | up to 2.29.18 | — | No fix listed | CNA |
- Seraphinite Accelerator Vendorseraphinitesoft Affected up to 2.29.18 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-17532
- 2026-10-03 Alias added: GHSA-ff83-hfr5-72ch
References
Other 9
- https://www.wordfence.com/threat-intel/vulnerabilities/id/5aeea62b-bd6c-4fe2-8c0f-8c9919688e87?source=cve
- https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/cache_ex.php#L838
- https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/common.php#L6036
- https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.18/cache.php#L76
- https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache_ex.php#L838
- https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/common.php#L6036
- https://plugins.trac.wordpress.org/browser/seraphinite-accelerator/tags/2.29.15/cache.php#L76
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3624461%40seraphinite-accelerator%2Ftrunk%2Fcommon.php&old=3619618%40seraphinite-accelerator%2Ftrunk%2Fcommon.php&sfp_email=&sfph_mail=
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3624461%40seraphinite-accelerator%2Ftrunk%2Fcache_ex.php&old=3619618%40seraphinite-accelerator%2Ftrunk%2Fcache_ex.php&sfp_email=&sfph_mail=
More seraphinitesoft vulnerabilities
- TI-2026-83481 Sensitive information exposure in Seraphinite Accelerator object cache CVSS 3.1MEDIUM 5.3
- TI-2024-11276 Seraphinite Bulk Discounts for WooCommerce <= 2.4.6 - Reflected Cross-Site Scripting CVSS 3.1MEDIUM 6.1
- TI-2026-02640 Seraphinite Accelerator <= 2.28.14 - Missing Authorization to Authenticated (Subscriber+) Log Clearing CVSS 3.1MEDIUM 4.3
- TI-2025-05471 Seraphinite Accelerator <= 2.27.21 - Cross-Site Request Forgery to Multiple Administrative Actions CVSS 3.1MEDIUM 4.3
Sources
- CVE-2026-17532 · CVE Program
- CVE-2026-17532 · NVD
- FIRST EPSS
- GHSA-ff83-hfr5-72ch · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences