Speed Optimizer <= 7.8.0 — Authenticated (Contributor+) Stored Cross-Site Scripting via Image Tag Attributes
CVE-2026-15421Published · Updated Action summary
Affected: ≤7.8.0Update to 7.8.1 or newer
All remediation steps- Severity
- Medium6.4
- CVSS
- 6.4CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Speed Optimizer – The All-In-One Performance-Boosting Plugin sg-cachepress
- Affected≤ 7.8.0
- Patched in7.8.1
Update to 7.8.1 or newer.
You are affected if you run ≤ 7.8.0. Version 7.8.1 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Speed Optimizer – The All-In-One Performance-Boosting Plugin.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 7.8.1, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Speed Optimizer – The All-In-One Performance-Boosting Plugin to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to stealthcopter.
The Speed Optimizer – The All-In-One Performance-Boosting Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Image Tag Attributes in all versions up to, and including, 7.8.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is only exploitable when the site administrator has enabled the Lazy Load Media option in the plugin settings.
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 Speed Optimizer – The All-In-One Performance-Boosting Plugin
All 5| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.4 | Authenticated (Administrator+) Stored Cross-Site Scripting <7.8.5Update to 7.8.5 | CVE-2026-111737 | |
| Low2.7 | Missing Authorization <7.8.5Update to 7.8.5 | CVE-2026-111738 | |
| Medium5.3 | Missing Authorization via purge_on_other_events() ≤7.4.6Update to 7.5.0 | CVE-2024-32532 | |
| Critical9.8 | Missing Authorization <5.0.13Update to 5.0.13 | CVE-2019-25217 |
- Medium4.4Authenticated (Administrator+) Stored Cross-Site Scripting
<7.8.5Update to 7.8.5
- Low2.7Missing Authorization
<7.8.5Update to 7.8.5
- Medium5.3Missing Authorization via purge_on_other_events()
≤7.4.6Update to 7.5.0
- Critical9.8Missing Authorization
<5.0.13Update to 5.0.13
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 6.4
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.