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CVE-2026-84899— VikWidgetsLoader < 1.12.0 - Contributor+ Stored XSS via Gutenberg Block class_suffix

Quick assessment

Affected
Unknown VikWidgetsLoader
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.

VikWidgetsLoader WordPress 插件在 1.12.0 版本之前，未对输出到内联脚本中的块属性进行净化（sanitize）或转义（escape）。这允许具有“贡献者”（Contributor）角色的用户在任意用户（包括审阅待定投稿的管理员）的浏览器中，通过查看受影响的帖子来执行任意 JavaScript，从而可能导致存储型跨站脚本（Stored XSS）漏洞。

AI Predicted 7.3 Difficulty: Moderate EPSS 0.43% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown VikWidgetsLoader 1.11.0< 1.12.0 affected
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I. Basic Information for CVE-2026-84899

Vulnerability Information
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Vulnerability Title
VikWidgetsLoader < 1.12.0 - Contributor+ Stored XSS via Gutenberg Block class_suffix
Source: CVE Program / CVE List V5
Vulnerability Description
The VikWidgetsLoader WordPress plugin before 1.12.0 does not sanitise or escape a block attribute before outputting it inside an inline script, allowing users with the Contributor role to store arbitrary JavaScript that executes in the browser of any user viewing the affected post, including the administrator who reviews the pending submission.
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 VikWidgetsLoader 1.11.0 ~ 1.12.0 -

II. Public POCs for CVE-2026-84899

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III. Intelligence Information for CVE-2026-84899

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Security Blog Posts for CVE-2026-84899 (1)

Same Patch Batch · Unknown · 2026-09-05 · 34 CVEs total

CVE-2026-77826 RegistrationMagic 5.0.1.8 - 6.0.9.8 - Unauthenticated Authentication Bypass via Missing Fa
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CVE-2026-81424 Accept Stripe Payments < 2.1.4 - Unauthenticated Product Substitution via IDOR
CVE-2026-83543 Greenshift < 13.2.0 - Contributor+ SSRF via get-csv-to-json REST Endpoint
CVE-2026-83544 Greenshift < 13.2.0 - Contributor+ Stored XSS via Block Animation customProps Attribute
CVE-2026-81423 Accept Stripe Payments < 2.1.4 - Open Redirect via IPN Handler
CVE-2026-81348 My Private Site < 4.2.3 - Unauthenticated Sensitive Information Exposure via RSS Feeds and
CVE-2026-81404 IPGP Visitors Origin < 1.6 - Reflected XSS
CVE-2026-78362 SEO Flow by LupsOnline 3.0.0 - 3.0.2 - Unauthenticated Privilege Escalation via API Key Au
CVE-2026-82846 Masteriyo LMS 1.18.0 - 2.3.3 - Instructor+ Stored XSS via Course Custom Fields
CVE-2026-78149 Post Carousel 4.0.0 - 4.0.7 - Unauthenticated Password-Protected Post Content and post_pas
CVE-2026-78150 Post Carousel 4.0.0 - 4.0.7 - Contributor+ Private and Protected Post Content Disclosure v
CVE-2026-19861 JetFormBuilder < 3.6.5.2 - Unauthenticated Stored XSS via WYSIWYG Field in Notification Em
CVE-2026-15247 Search Atlas SEO < 2.6.24 - Subscriber+ Google Service Account Credential Overwrite/Deleti
CVE-2026-19858 JetFormBuilder < 3.6.5.2 - Unauthenticated Password Hash and Arbitrary Metadata Disclosure
CVE-2025-15694 Joli Table Of Contents 2.0.0 - 2.8.0 - Admin+ Stored XSS
CVE-2025-15693 JCH Optimize 4.2.1 - 5.0.0 - Admin+ Path Traversal
CVE-2026-84937 YT Player < 2.1.0 - Contributor+ SQLi via ytp_ajax
CVE-2026-84021 Bold Page Builder < 5.9.8 - Contributor+ Stored XSS via bt_bb_button/bt_bb_headline/bt_bb_
CVE-2026-84022 Bold Page Builder < 5.9.8 - Contributor+ Stored XSS via Multiple Shortcode Element Attribu

Showing top 20 of 34 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: VikWidgetsLoader
Same vendor: Unknown