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CVE-2026-0551— PPWP – Password Protect Pages <= 1.9.18 - Authenticated (Contributor+) PHP Object Injection via post_protection_roles

Quick assessment

Affected
buildwps PPWP – Password Protect Pages
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 的 PPWP – Password Protect Pages 插件在 1.9.18 及之前版本中存在 PHP 对象注入漏洞，该漏洞是由于对来自易受攻击参数 “post_protection_roles” 的不可信输入进行反序列化所致。这使得拥有贡献者（Contributor）级别及以上权限的已认证攻击者能够注入 PHP 对象。 由于易受攻击的软件本身不包含任何已知的 POP（Property-Oriented Programming）链，因此该漏洞在没有其他包含 POP 链的插件或主题的情况下

CVSS 8.8 · High EPSS 0.75% · P52

Affected Version Matrix 1

VendorProduct Version RangeStatus
buildwps PPWP – Password Protect Pages ≤ 1.9.18 affected
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I. Basic Information for CVE-2026-0551

Vulnerability Information
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Vulnerability Title
PPWP – Password Protect Pages <= 1.9.18 - Authenticated (Contributor+) PHP Object Injection via post_protection_roles
Source: CVE Program / CVE List V5
Vulnerability Description
The PPWP – Password Protect Pages plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.9.18 via deserialization of untrusted input from the 'post_protection_roles' vulnerable parameter. This makes it possible for authenticated attackers, with Contributor-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
buildwps PPWP – Password Protect Pages 0 ~ 1.9.18 -

II. Public POCs for CVE-2026-0551

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III. Intelligence Information for CVE-2026-0551

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Patches & Fixes for CVE-2026-0551 (1)

Vendor Advisories for CVE-2026-0551 (1)

IV. Related Vulnerabilities

Same product: PPWP – Password Protect Pages
Same vendor: buildwps
Same weakness: CWE-502

V. Comments for CVE-2026-0551

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