Smush – Image Optimization, Compression, Lazy Load, WebP & CDN <= 4.2.0 — Unauthenticated Denial of Service
CVE-2026-81285Published · Updated Action summary
Affected: ≤4.2.0Update to 4.3.0 or newer
All remediation steps- Severity
- High7.5
- CVSS
- 7.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:NIntegrity- None
A:HAvailability- High
- Required access
- No account needed
- 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≤ 4.2.0
- Patched in4.3.0
Update to 4.3.0 or newer.
You are affected if you run ≤ 4.2.0. Version 4.3.0 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.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 4.3.0, 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, credited to Asim Alshaya.
The Smush – Image Optimization, Compression, Lazy Load, WebP & CDN plugin for WordPress is vulnerable to Denial of Service in all versions up to, and including, 4.2.0. This is due to insufficient validation of user supplied input. This makes it possible for unauthenticated attackers to make the affected site unavailable.
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 | |
| High7.2 | Authenticated (Administrator+) Remote Code Execution <4.3.2Update to 4.3.2 | CVE-2026-19223 | |
| Low2.7 | Authenticated (Admin+) Directory Traversal ≤3.17.0Update to 3.17.1 | CVE-2025-22288 |
- 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
- High7.2Authenticated (Administrator+) Remote Code Execution
<4.3.2Update to 4.3.2
- Low2.7Authenticated (Admin+) Directory Traversal
≤3.17.0Update to 3.17.1
Timeline
CVE published
Severity high, CVSS 7.5
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. 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.