EUVD-2026-57960
GHSA-q9rr-4vhv-p828
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Network-reachable via WordPress HTTP; subscriber account required (PR:L); no integrity or availability impact confirmed; scope unchanged within plugin boundary.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
1DescriptionCVE.org
Subscriber Broken Access Control in AcyMailing SMTP Newsletter <= 10.11.1 versions.
AnalysisAI
Broken access control in the AcyMailing SMTP Newsletter WordPress plugin (versions <= 10.11.1) permits subscriber-level users to access restricted functionality reserved for higher-privileged roles. The flaw, rooted in missing authorization checks (CWE-862), allows a low-privileged but authenticated WordPress user to read sensitive newsletter data - including subscriber lists, campaign details, or configuration - that should require administrator or editor access. No public exploit or active exploitation via CISA KEV is confirmed at time of analysis, though Patchstack has documented and disclosed the vulnerability.
Technical ContextAI
AcyMailing SMTP Newsletter is a WordPress plugin (CPE: cpe:2.3:a:acymailing_newsletter_team:acymailing_smtp_newsletter:*:*:*:*:*:*:*:*) used for email marketing and newsletter management within WordPress sites. The vulnerability class is CWE-862 (Missing Authorization), which occurs when code exposes functionality or data without validating that the calling user holds the necessary role or capability. In WordPress, the subscriber role is the lowest authenticated role with no administrative rights. The plugin fails to enforce WordPress capability checks on certain endpoints or AJAX handlers, allowing a subscriber to reach code paths intended exclusively for administrators or editors - a classic vertical privilege escalation via broken access control.
RemediationAI
The primary remediation is to upgrade the AcyMailing SMTP Newsletter plugin beyond version 10.11.1. Based on the affected range (<=10.11.1), users should update to the latest available version via the WordPress plugin repository; however, the exact patched version number has not been confirmed from available input data - verify the changelog at the AcyMailing plugin page on wordpress.org before upgrading. The Patchstack advisory at https://patchstack.com/database/wordpress/plugin/acymailing/vulnerability/wordpress-acymailing-smtp-newsletter-plugin-10-11-1-broken-access-control-vulnerability?_s_id=cve should be monitored for patch confirmation. As an immediate compensating control, administrators should disable open user registration on the WordPress site (Settings > General > uncheck 'Anyone can register') to remove the ability for unauthorized parties to self-register subscriber accounts, which directly eliminates the attack surface for unauthenticated external actors. This control has minimal side effects on sites where registration is not a required feature. WAF rules blocking access to the specific AcyMailing admin-bound REST or AJAX endpoints from subscriber sessions may also reduce exposure pending a patch.
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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