ShortPixel Image Optimizer <= 6.5.5 - Authenticated (Author+) PHP Object Injection via Nested JSON Post Content
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.
Summary
The ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 6.5.5 via deserialization of untrusted input . This makes it possible for authenticated attackers, with author-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ShortPixel | ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF | up to 6.5.5 | — | No fix listed | CNA |
- ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF VendorShortPixel Affected up to 6.5.5 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-17086
- 2026-10-03 Alias added: GHSA-mqfm-qx5g-96vc
References
Other 14
- https://www.wordfence.com/threat-intel/vulnerabilities/id/89ef2ee1-2bec-459f-9a85-c260cbb129ca?source=cve
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L402
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L425
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L429
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L446
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/class/Controller/Optimizer/OptimizeAiController.php#L598
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixel/replacer2/src/Replacer.php#L259
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L402
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L425
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L429
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L446
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/class/Controller/Optimizer/OptimizeAiController.php#L598
- https://plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixel/replacer2/src/Replacer.php#L259
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3688579%40shortpixel-image-optimiser&new=3688579%40shortpixel-image-optimiser
More ShortPixel vulnerabilities
- TI-2023-04280 Enable Media Replace < 4.1.3 - Author+ PHP Object Injection CVSS 3.1HIGH 8.8
- TI-2023-00241 Enable Media Replace < 4.0.2 - Author+ Arbitrary File Upload CVSS 3.1HIGH 8.8
- TI-2023-00318 ShortPixel Adaptive Images < 3.6.3 - Reflected XSS CVSS 3.1MEDIUM 6.1
- TI-2026-83296 PHP object injection in Enable Media Replace WordPress plugin CVSS 3.1HIGH 8.8
- TI-2023-15794 WordPress ShortPixel Adaptive Images Plugin <= 3.7.1 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
- TI-2024-32246 WordPress ShortPixel Image Optimizer plugin <= 5.6.3 - Broken Access Control vulnerability CVSS 3.1HIGH 8.8
Sources
- CVE-2026-17086 · CVE Program
- CVE-2026-17086 · NVD
- FIRST EPSS
- GHSA-mqfm-qx5g-96vc · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences