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CVE-2026-80338— CMB2 < 2.13.0 - Subscriber+ Arbitrary Option Corruption via oEmbed Handler

Quick assessment

Affected
Unknown CMB2
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.

在 2.13.0 版本之前的 CMB2 WordPress 插件未对其其中一个 AJAX 操作执行任何权限检查，这使得角色权限最低的订阅者（Subscriber）用户能够创建任意 WordPress 选项并破坏现有选项，从而导致核心站点设置受损并使站点离线。 利用该漏洞要求站点上安装了另一个 2.13.0 版本之前的 CMB2 WordPress 插件，并且该插件声明了一个 oEmbed 字段，因为 2.13.0 版本之前的 CMB2 WordPress 插件本身并未注册任何此类字段。由于存储的值永远不由攻击者控制

EPSS 0.18% · P7
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I. Basic Information for CVE-2026-80338

Vulnerability Information
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Vulnerability Title
CMB2 < 2.13.0 - Subscriber+ Arbitrary Option Corruption via oEmbed Handler
Source: CVE Program / CVE List V5
Vulnerability Description
The CMB2 WordPress plugin before 2.13.0 does not perform any capability check on one of its AJAX actions, allowing users with a role as low as Subscriber to create arbitrary WordPress options and corrupt existing ones, which can break core site settings and take the site offline. Exploitation requires the site's or another CMB2 WordPress plugin before 2.13.0 to have declared an oEmbed field, as the CMB2 WordPress plugin before 2.13.0 registers none of its own. The stored value is never attacker-controlled, so the issue does not lead to privilege escalation.
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 CMB2 0 ~ 2.13.0 -

II. Public POCs for CVE-2026-80338

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III. Intelligence Information for CVE-2026-80338

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Other References for CVE-2026-80338 (1)

Same Patch Batch · Unknown · 2026-09-24 · 16 CVEs total

CVE-2026-93662 Events Manager 7.4.1 - 7.4.4 - Subscriber+ Unpublished Event and Location Disclosure via '
CVE-2026-93661 Events Manager < 7.4.5 - Contributor+ Arbitrary Ticket Overwrite via IDOR
CVE-2026-88847 MasterStudy LMS < 3.7.50 - Subscriber+ Lesson Completion Record Creation
CVE-2026-89004 WPeMatico RSS Feed Fetcher < 2.8.26 - Contributor+ Campaign Configuration and Log Disclosu
CVE-2026-89005 WPeMatico RSS Feed Fetcher < 2.8.26 - Contributor+ Stored XSS via Word to Category
CVE-2026-89002 WPeMatico RSS Feed Fetcher < 2.8.26 - Contributor+ Stored XSS via Campaign Item Preview
CVE-2026-88843 MasterStudy LMS 3.5.29 - < 3.7.50 - Contributor+ LFI via Elementor Courses Categories Widg
CVE-2026-88846 MasterStudy LMS 2.3.0 - < 3.7.50 - Unauthenticated Account Creation with Registration Disa
CVE-2026-88845 MasterStudy LMS 2.3.0 - < 3.7.50 - Subscriber+ Course and Lesson Creation via Demo Import
CVE-2026-82195 10Web Booster < 2.34.0 - Unauthenticated Connection Secret Disclosure and Deletion
CVE-2026-82850 Masteriyo LMS < 3.4.2 - Subscriber+ Quiz Answer Key Disclosure
CVE-2026-82849 Masteriyo LMS < 3.4.2 - Subscriber+ Arbitrary User Course Progress Disclosure via IDOR
CVE-2026-84151 The Post Grid < 7.9.5 - Contributor+ Stored HTML/iframe Injection via wp_kses_post Allow-L
CVE-2026-74991 WPForms Lite 1.8.8.2 - 2.0.1.1 - Unauthenticated Stripe Refund and Subscription Cancellati
CVE-2026-80513 wpForo Forum < 3.1.6 - Subscriber+ PHP Object Injection via Profile Fields

IV. Related Vulnerabilities

Same product: CMB2
Same vendor: Unknown

V. Comments for CVE-2026-80338

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