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EWWW Image Optimizer <= 2.8.4 — Remote Code Execution

CVE-2016-20010Published · Updated

Action summary

Affected: ≤2.8.4Update to 2.8.5 or newer

All remediation steps
Watch plugin
Severity
Critical9.6
CVSS
9.6
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:R User interaction
Required
S:C Scope
Changed
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-94 Improper Control of Generation of Code
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

EWWW Image Optimizer ewww-image-optimizer

  1. Affected≤ 2.8.4
  2. Patched in2.8.5

Update to 2.8.5 or newer.

You are affected if you run ≤ 2.8.4. Version 2.8.5 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under EWWW Image Optimizer.
  • 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

  1. Update to version 2.8.5, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch EWWW Image Optimizer to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Sean Murphy.

EWWW Image Optimizer before 2.8.5 allows remote command execution because it relies on a protection mechanism involving boolval, which is unavailable before PHP 5.5. Version 2.8.4 provides a partial fix.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in EWWW Image Optimizer

All 14
More vulnerabilities in EWWW Image Optimizer
SeverityVulnerabilityCVEPublished
Medium6.48.9.0 - Authenticated (Author+) Stored Cross-Site Scripting
8.7.4 – 8.9.0Update to 8.9.1
CVE-2026-91049
Medium6.1Reflected Cross-Site Scripting via REQUEST_URI Parameter Key
≤8.7.7Update to 8.8.0
CVE-2026-92826
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤8.7.7Update to 8.8.0
CVE-2026-97067
High7.58.7.7 - Authenticated (Author+) PHP Object Injection
8.6.0 – 8.7.7Update to 8.8.0
CVE-2026-91051
Medium4.7Authenticated (Administrator+) Cross-Site WebP File Deletion or Rename
≤8.7.0Update to 8.8.0
CVE-2026-91072

Timeline

  1. CVE published

    Severity critical, CVSS 9.6

  2. 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.

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