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CVE-2026-86824— Newsletter < 9.3.8 - Unauthenticated Subscriber PII Disclosure and Modification via Predictable Tracking Signature Key

Quick assessment

Affected
Unknown Newsletter
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.

The Newsletter WordPress 插件在 9.3.8 版本之前未使用足够的随机性（熵）来生成其邮件追踪签名密钥，并使用无密钥哈希对追踪链接进行签名。这使得经过离线分析恢复该密钥的未经身份验证的攻击者能够伪造追踪链接，从而获取任意订阅者的会话令牌，并读取和修改该订阅者存储的个人数据。

AI Predicted 9.8 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1528.001
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I. Basic Information for CVE-2026-86824

Vulnerability Information
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Vulnerability Title
Newsletter < 9.3.8 - Unauthenticated Subscriber PII Disclosure and Modification via Predictable Tracking Signature Key
Source: CVE Program / CVE List V5
Vulnerability Description
The Newsletter WordPress plugin before 9.3.8 does not generate its email tracking signing key with sufficient entropy and signs its tracking links with an unkeyed hash, allowing an unauthenticated attacker who recovers that key offline to forge tracking links, obtain any subscriber's session token, and read and modify that subscriber's stored personal data.
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 Newsletter 0 ~ 9.3.8 -

II. Public POCs for CVE-2026-86824

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III. Intelligence Information for CVE-2026-86824

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Other References for CVE-2026-86824 (1)

Same Patch Batch · Unknown · 2026-09-17 · 29 CVEs total

CVE-2026-86801 8.8 HIGH To Do List Member 1.4 - 1.6 - Unauthenticated Stored XSS, File Listing and Deletion via Un
CVE-2026-87963 8.6 HIGH Yo 1.1 - 1.3.1 - Unauthenticated SQL Injection via username Parameter
CVE-2026-87829 4.3 MEDIUM Checkout Field Manager < 7.9.7 - Subscriber+ Arbitrary Attachment Deletion via Unvalidated
CVE-2026-87831 4.3 MEDIUM Checkout Field Manager < 7.9.7 - Subscriber+ Arbitrary Attachment Deletion via Customer Ad
CVE-2026-91017 3.7 LOW Robokassa payment gateway for Woocommerce < 1.8.9 - Unauthenticated Payment Bypass via For
CVE-2025-15697 Dictionary <= 1.0 - Reflected XSS via Multiple Parameters
CVE-2026-85128 Choose User Role at Registration for WooCommerce < 1.3.3 - Unauthenticated Privilege Escal
CVE-2026-85130 WPLP Cookie Consent < 4.4.4 - Unauthenticated Stored XSS via Consent Logs
CVE-2026-86707 Private Feed Key <= 0.1 - Unauthenticated Authentication Bypass via 'feedkey' Parameter
CVE-2026-86709 The Pressengine <= 1.0 - Unauthenticated Authentication Bypass
CVE-2026-86710 Login with QR <= 1.0.0 - Unauthenticated Authentication Bypass via 'autologin_code' Parame
CVE-2026-86446 LearnPress 4.4.3 - 4.4.6 - Unauthenticated Quiz Answer Disclosure via check-answer REST En
CVE-2026-87836 Comments Import & Export 2.1.11 - 2.5.3 - Author+ Comment PII Disclosure via Export
CVE-2026-87786 Dewa Kirim <= 1.0.0 - Unauthenticated Stored XSS via Checkout Coordinates
CVE-2026-86788 HT Mega 3.2.0 - 3.2.5 - Contributor+ Stored XSS via Section Headline Tag
CVE-2026-90922 Paid Member Subscriptions < 3.0.9 - Unauthenticated Membership Payment Bypass via PayPal S
CVE-2026-88792 Dictionary <= 1.0 - Unauthenticated Stored XSS via Direct Dictionary Update
CVE-2026-88795 wpShopGermany IT-RECHT KANZLEI < 2.4 - Unauthenticated RCE via Predictable API Token
CVE-2026-88904 PuppyFW <= 0.4.4 - Subscriber+ Arbitrary Blog Options Update and Deletion Leading to Privi
CVE-2026-90923 Autopay < 5.0.1 - Unauthenticated Cross-Customer Order Payment Parameter Disclosure and De

Showing top 20 of 29 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Newsletter
Same vendor: Unknown

V. Comments for CVE-2026-86824

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