ShortPixel Image Optimizer <= 6.5.5 - Authenticated (Author+) PHP Object Injection via Nested JSON Post Content

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-17086
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 04:17:28 UTC
Updated2026-09-18 04:17:28 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-502 | CWE-502 CWE-502 Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Shortpixel ShortPixel Image Optimizer Optimize Images Convert WebP AVIF affected 6.5.5 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixe... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/89ef2ee1-2bec-459f-9a85-c260c... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/class/Controlle... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.1/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/build/shortpixe... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.5.4/class/Controlle... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Josh Bolding (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-31T21:06:36.000ZVendor Notified
CNA2026-09-17T14:29:30.000ZDisclosed

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