WP Compress – Instant Performance & Speed Optimization <= 6.30.03 — Reflected Cross-Site Scripting via custom_server Parameter
CVE-2024-12047Published · Updated Action summary
Affected: ≤6.30.03Update to 6.30.04 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?
WP Compress – Instant Performance & Speed Optimization wp-compress-image-optimizer
- Affected≤ 6.30.03
- Patched in6.30.04
Update to 6.30.04 or newer.
You are affected if you run ≤ 6.30.03. Version 6.30.04 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WP Compress – Instant Performance & Speed Optimization.
- 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 6.30.04, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch WP Compress – Instant Performance & Speed Optimization to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to vgo0.
The WP Compress – Instant Performance & Speed Optimization plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘custom_server’ parameter in all versions up to, and including, 6.30.03 due to insufficient input sanitization and output escaping. 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 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 WP Compress – Instant Performance & Speed Optimization
All 19| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.8 | Unauthenticated Privilege Escalation to 'group'/'setting'/'value' Parameters on comms Endpoint ≤7.25.00Update to 7.26.00 | CVE-2026-104755 | |
| Medium5.3 | Missing Authorization to Unauthenticated Account Linking / Site Takeover via 'force_ic_connect' and 'apikey' Parameters ≤7.22.01Update to 7.22.38 | CVE-2026-120551 | |
| Medium5.3 | Missing Authorization to Unauthenticated Settings Update ≤7.21.28Update to 7.22.0 | CVE-2026-84757 | |
| Critical9.8 | Unauthenticated Remote Code Execution <7.20.01Update to 7.20.01 | CVE-2026-73343 | |
| Medium6.5 | Cross-Site Request Forgery to Arbitrary Options Deletion ≤7.10.09Update to 7.20.01 | CVE-2026-17608 |
- Medium4.8Unauthenticated Privilege Escalation to 'group'/'setting'/'value' Parameters on comms Endpoint
≤7.25.00Update to 7.26.00
- Medium5.3Missing Authorization to Unauthenticated Account Linking / Site Takeover via 'force_ic_connect' and 'apikey' Parameters
≤7.22.01Update to 7.22.38
- Medium5.3Missing Authorization to Unauthenticated Settings Update
≤7.21.28Update to 7.22.0
- Critical9.8Unauthenticated Remote Code Execution
<7.20.01Update to 7.20.01
- Medium6.5Cross-Site Request Forgery to Arbitrary Options Deletion
≤7.10.09Update to 7.20.01
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.