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CVE-2026-88903— Topcontent <= 1.2.1 - Unauthenticated Stored XSS via Content Webhook

Quick assessment

Affected
Unknown Topcontent
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.

Topcontent WordPress 插件（版本 1.2.1 及更早版本）在处理某个请求时未进行正确的授权验证，并且在存储提交内容之前禁用了 HTML sanitization（HTML 净化/过滤）功能。这使得未经身份验证的攻击者能够在任何尚未配置 API 密钥的网站上发布包含恶意 JavaScript 的任意帖子。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Topcontent ≤ 1.2.1 affected
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I. Basic Information for CVE-2026-88903

Vulnerability Information
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Vulnerability Title
Topcontent <= 1.2.1 - Unauthenticated Stored XSS via Content Webhook
Source: CVE Program / CVE List V5
Vulnerability Description
The Topcontent WordPress plugin through 1.2.1 does not properly authorise one of its request handlers and disables HTML sanitisation before storing the submitted content, allowing unauthenticated attackers to publish arbitrary posts containing malicious JavaScript on any site where its API key has never been configured.
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 Topcontent 0 ~ 1.2.1 -

II. Public POCs for CVE-2026-88903

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III. Intelligence Information for CVE-2026-88903

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Other References for CVE-2026-88903 (1)

Same Patch Batch · Unknown · 2026-10-11 · 63 CVEs total

CVE-2026-84251 click5 CRM add-on to Ninja Forms <= 1.0.1 - Unauthenticated Arbitrary Options Update
CVE-2026-104680 Envira Gallery < 1.16.2 - Multisite Subsite Admin+ Arbitrary Plugin Installation via Onboa
CVE-2026-104681 Envira Gallery < 1.16.2 - Author+ Non-Public Post Title and Excerpt Disclosure via Gallery
CVE-2026-104682 Envira Gallery < 1.16.2 - Contributor Missing Authorization via Convert Gallery REST Route
CVE-2026-104028 Anton Extensions <= 1.2.2 - Unauthenticated Arbitrary File Upload to RCE
CVE-2026-81649 Fundiin <= 3.4.0 - Unauthenticated Payment Gateway Settings Update and Credential Disclosu
CVE-2026-81155 Robo Gallery < 5.2.6 - Author+ Stored XSS via Gallery Search Label
CVE-2026-81154 Robo Gallery < 5.2.6 - Author+ Stored XSS via Image Alt Text
CVE-2026-81420 Tcard WP <= 1.8.0 - Unauthenticated SQLi via group_id Parameter
CVE-2026-81156 Robo Gallery < 5.2.6 - Contributor+ Stored XSS via Gallery Settings
CVE-2026-14854 WooCommerce Bookings < 3.11.0 - Unauthenticated Denial of Service
CVE-2026-84252 click5 CRM add-on to WPForms <= 1.0.3 - Unauthenticated Arbitrary Options Update
CVE-2026-84260 click5 CRM add-on to Gravity Forms <= 1.0.3 - Unauthenticated Stored XSS via post_notifica
CVE-2026-84259 click5 CRM add-on to WPForms <= 1.0.3 - Unauthenticated Stored XSS via post_notifications
CVE-2026-84253 click5 CRM add-on to Gravity Forms <= 1.0.3 - Unauthenticated Arbitrary Options Update
CVE-2026-84261 click5 CRM add-on to Contact Form 7 <= 1.0.4 - Unauthenticated Stored XSS via post_notific
CVE-2026-84254 click5 CRM add-on to Contact Form 7 <= 1.0.4 - Unauthenticated Arbitrary Options Update
CVE-2026-84258 click5 CRM add-on to Ninja Forms <= 1.0.1 - Unauthenticated Stored XSS via post_notificati
CVE-2026-84737 Freeton WP <= 1.0.0 - Unauthenticated Account Takeover via 'secod' Parameter
CVE-2026-84734 Mindstien Quick Login <= 1.0 - Unauthenticated Administrator Account Takeover via 'mql_pas

Showing top 20 of 63 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same vendor: Unknown

V. Comments for CVE-2026-88903

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