Seraphinite Accelerator <= 2.29.18 — Reflected Cross-Site Scripting
CVE-2026-17532Published · Updated Action summary
Affected: ≤2.29.18Update to 2.29.19 or newer
All remediation steps- Severity
- Medium6.1
- CVSS
- 6.1CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:RUser interaction- Required
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Seraphinite Accelerator seraphinite-accelerator
- Affected≤ 2.29.18
- Patched in2.29.19
Update to 2.29.19 or newer.
You are affected if you run ≤ 2.29.18. Version 2.29.19 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Seraphinite Accelerator.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 2.29.19, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Seraphinite Accelerator to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Alireza.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Seraphinite Accelerator
All 13| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Unauthenticated Sensitive Information Exposure in Object Cache Directory ≤2.29.24Update to 2.29.25 | CVE-2026-90960 | |
| Medium4.3 | Authenticated (Subscriber+) Full Admin Area Denial of Service ≤2.29.23Update to 2.29.24 | CVE-2026-87828 | |
| Medium4.3 | Authenticated (Subscriber+) Exposure of Sensitive Information to an Unauthorized Actor ≤2.28.14Update to 2.28.15 | CVE-2026-3058 | |
| Medium4.3 | Missing Authorization to Authenticated (Subscriber+) Log Clearing ≤2.28.14Update to 2.28.15 | CVE-2026-3056 | |
| Medium4.3 | Cross-Site Request Forgery to Multiple Administrative Actions ≤2.27.21Update to 2.27.22 | CVE-2025-6059 |
- Medium5.3Unauthenticated Sensitive Information Exposure in Object Cache Directory
≤2.29.24Update to 2.29.25
- Medium4.3Authenticated (Subscriber+) Full Admin Area Denial of Service
≤2.29.23Update to 2.29.24
- Medium4.3Authenticated (Subscriber+) Exposure of Sensitive Information to an Unauthorized Actor
≤2.28.14Update to 2.28.15
- Medium4.3Missing Authorization to Authenticated (Subscriber+) Log Clearing
≤2.28.14Update to 2.28.15
- Medium4.3Cross-Site Request Forgery to Multiple Administrative Actions
≤2.27.21Update to 2.27.22
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity medium, CVSS 6.1
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.