Smush – Lazy Load Images, Optimize & Compress Images <= 3.0.0 — Authenticated PHAR Deserialization
15654ff3-2e61-44d2-ae3f-4a353db320cbPublished · Updated Action summary
Affected: ≤3.0.0Update to 3.0.1 or newer
All remediation steps- Severity
- High8.8
- CVSS
- 8.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-502 PHP Object Injection
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Smush – Image Optimization, Compression, Lazy Load, WebP & CDN wp-smushit
- Affected≤ 3.0.0
- Patched in3.0.1
Update to 3.0.1 or newer.
You are affected if you run ≤ 3.0.0. Version 3.0.1 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Smush – Image Optimization, Compression, Lazy Load, WebP & CDN.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 3.0.1, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Smush – Image Optimization, Compression, Lazy Load, WebP & CDN to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence.
The Smush – Lazy Load Images, Optimize & Compress Images plugin for WordPress is vulnerable to deserialization of untrusted input via the '$log_file' value in versions up to, and including 3.0.0. This makes it possible for authenticated attackers to call files using a PHAR wrapper that will deserialize the data and call arbitrary PHP Objects that can be used to perform a variety of malicious actions granted a POP chain is also present. It also requires that the attacker is successful in uploading a file with the serialized payload.
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 Smush – Image Optimization, Compression, Lazy Load, WebP & CDN
All 11| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.3 | Authenticated (Author+) Insecure Direct Object Reference <4.3.6Update to 4.3.6 | CVE-2026-118241 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤4.3.5Update to 4.3.6 | CVE-2026-120845 | |
| Low2.7 | Missing Authorization ≤4.3.3Update to 4.3.4 | CVE-2026-110039 | |
| High7.5 | Unauthenticated Denial of Service ≤4.2.0Update to 4.3.0 | CVE-2026-81285 | |
| High7.2 | Authenticated (Administrator+) Remote Code Execution <4.3.2Update to 4.3.2 | CVE-2026-19223 |
- Medium4.3Authenticated (Author+) Insecure Direct Object Reference
<4.3.6Update to 4.3.6
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤4.3.5Update to 4.3.6
- Low2.7Missing Authorization
≤4.3.3Update to 4.3.4
- High7.5Unauthenticated Denial of Service
≤4.2.0Update to 4.3.0
- High7.2Authenticated (Administrator+) Remote Code Execution
<4.3.2Update to 4.3.2
Same weakness (PHP Object Injection)
All PHP Object Injection| 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 high, CVSS 8.8
Record last updated
Sources & licenses
- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- 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.