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CVE-2026-81655— Ad Inserter 2.8.12 - 2.8.18 - Subscriber+ RCE / Stored XSS via Global Custom Fields

Quick assessment

Affected
Unknown Ad Inserter
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.

Ad Inserter WordPress 插件在 2.8.19 版本之前，未能正确限制对其某个设置页面的访问权限。在用户自身配置允许的情况下，该页面可被所有已登录用户访问。此外，该插件未对在此页面保存的内容进行过滤，导致具备 Subscriber（订阅者）等低权限角色的用户能够存储可执行 PHP 代码或未经转义即可向网站访客展示的内容，从而引发远程代码执行或跨站脚本（XSS）等安全风险。

AI Predicted 8.8 Difficulty: Easy EPSS 0.15% · P4
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I. Basic Information for CVE-2026-81655

Vulnerability Information
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Vulnerability Title
Ad Inserter 2.8.12 - 2.8.18 - Subscriber+ RCE / Stored XSS via Global Custom Fields
Source: CVE Program / CVE List V5
Vulnerability Description
The Ad Inserter WordPress plugin before 2.8.19 does not correctly restrict access to one of its settings pages, making it reachable by every logged in user under a configuration its own settings allow, and does not filter the content saved there, allowing users with a role as low as subscriber to store code which is then executed as PHP or served unescaped to site visitors.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Ad Inserter 2.8.12 ~ 2.8.19 -

II. Public POCs for CVE-2026-81655

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III. Intelligence Information for CVE-2026-81655

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Other References for CVE-2026-81655 (1)

Same Patch Batch · Unknown · 2026-09-27 · 19 CVEs total

CVE-2026-89006 WPeMatico RSS Feed Fetcher < 2.8.27 - Contributor+ Stored XSS via Feed Import
CVE-2026-84069 WebFacing Email Accounts for cPanel 5.3 - 5.3.6 - Unauthenticated LFI via assets/index.php
CVE-2026-82841 UpdraftPlus 1.23.8 - 1.26.7 - Subscriber+ Remote Storage Credential Disclosure via Migrati
CVE-2026-85002 EmbedPress < 4.6.7 - Contributor+ Stored XSS via Instagram Carousel Block Attributes
CVE-2026-86609 Download Manager Pro < 7.5.6 - Unauthenticated Stored XSS via Email Lock Subscription
CVE-2026-86839 Bookly < 28.3 - Staff+ Appointment and Payment Disclosure, Modification and Deletion via I
CVE-2026-86841 Bookly 23.2 - 28.2 - Bookly Administrator+ PHP Object Injection via Diagnostics Advanced O
CVE-2026-89001 WPeMatico RSS Feed Fetcher < 2.8.27 - Contributor+ Post Publication and Author Spoofing vi
CVE-2026-89003 WPeMatico RSS Feed Fetcher < 2.8.27 - Contributor+ SSRF via Campaign Preview
CVE-2026-96899 Optima Express 8.6.0 - 8.7.5 - Author+ Stored XSS via faq_script
CVE-2026-89000 WPeMatico RSS Feed Fetcher < 2.8.27 - Contributor+ SSRF via Campaign Run
CVE-2026-96896 Malcure Malware Shield < 19.9.7 - Multisite Subsite Admin+ Arbitrary File Write and Deleti
CVE-2026-96897 Optima Express 8.5.0 - 8.7.5 - Unauthenticated Author Account Creation & Application Passw
CVE-2026-96895 WP YouTube Lyte < 1.7.31 - Contributor+ Stored XSS via Embed Block Attributes
CVE-2026-92995 Verge3D <= 4.13.0 - Unauthenticated Product Download Disclosure via v3d_download_file
CVE-2026-92436 Mailchimp for WooCommerce < 6.3 - Unauthenticated Customer Email and Cart Disclosure via I
CVE-2026-97319 PowerPress < 11.17.2 - Contributor+ Stored XSS via Podcast Player Block
CVE-2026-97227 NextScripts: Social Networks Auto-Poster < 4.4.8 - Authenticated Social Account Credential

IV. Related Vulnerabilities

Same product: Ad Inserter
Same vendor: Unknown

V. Comments for CVE-2026-81655

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