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CVE-2026-17086— ShortPixel Image Optimizer <= 6.5.5 - Authenticated (Author+) PHP Object Injection via Nested JSON Post Content

Quick assessment

Affected
shortpixel ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF 在 6.5.5 及之前所有版本中存在 PHP 对象注入漏洞，该漏洞由对不可信输入的反序列化操作引起。这使得具有作者权限或更高权限的已认证攻击者能够注入 PHP 对象。目前该受影响的软件中不存在已知的 POP（Payload Object Property）链，因此除非目标站点同时安装了包含 POP 链的其他插件或主题，否则此漏洞不会造成实际影响。如果目标系统上

CVSS 8.8 · High EPSS 0.89% · P58

Affected Version Matrix 1

VendorProduct Version RangeStatus
shortpixel ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF ≤ 6.5.5 affected
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I. Basic Information for CVE-2026-17086

Vulnerability Information
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Vulnerability Title
ShortPixel Image Optimizer <= 6.5.5 - Authenticated (Author+) PHP Object Injection via Nested JSON Post Content
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
shortpixel ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF 0 ~ 6.5.5 -

II. Public POCs for CVE-2026-17086

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III. Intelligence Information for CVE-2026-17086

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Other References for CVE-2026-17086 (11)

IV. Related Vulnerabilities

Same product: ShortPixel Image Optimizer – Optimize Images, Convert WebP & AVIF
Same vendor: shortpixel
Same weakness: CWE-502

V. Comments for CVE-2026-17086

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