CVE-2026-92989 in Newsletters Plugin
Summary
by MITRE • 10/09/2026
The SendPress Newsletters WordPress plugin through 1.26.1.20 does not check the user's capability on several newsletter-management actions, allowing any authenticated subscriber-level user to synchronise all site users into a mailing list and to drive the newsletter send queue.
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Analysis
by VulDB Data Team • 10/09/2026
The vulnerability identified in SendPress Newsletters versions through 1.26.1.20 represents a critical failure in access control mechanisms within the WordPress ecosystem. This flaw is categorized under CWE-862, which denotes Missing Authorization, and aligns with MITRE ATT&CK technique T1531, Accessing Cloud Accounts or Services for Initial Access or Persistence, as it allows an attacker to leverage compromised credentials to interact with external communication services without proper privilege verification. The core technical issue stems from the plugin's failure to validate user capabilities before executing sensitive administrative actions related to newsletter management. Specifically, functions responsible for synchronizing site users into mailing lists and triggering the dispatch of newsletters do not enforce role-based access controls that restrict these operations to administrators or users with explicit editorial privileges.
This lack of authorization checks creates a significant security gap where any authenticated user holding even the lowest privilege level in WordPress, such as a subscriber, can execute high-impact administrative functions. By exploiting this flaw, an attacker who has obtained valid credentials for a low-level account can manipulate the plugin's internal logic to aggregate all registered users on the website into specific mailing lists. This action effectively bypasses standard privacy and data handling protocols that would normally require higher clearance levels, potentially leading to unauthorized mass communication or data exposure depending on how the external email service provider handles the imported data.
The operational impact of this vulnerability extends beyond simple spamming capabilities. An attacker can drive the newsletter send queue using any configured SMTP settings or third-party API keys stored within the plugin's configuration. This capability allows for the execution of large-scale phishing campaigns, distribution of malware via malicious links embedded in newsletters, or simply overwhelming the site’s email infrastructure and associated external services with high volumes of traffic. Such actions can result in IP address blacklisting by major email providers, damage to the organization's reputation, and potential legal liabilities related to unsolicited communications under regulations such as GDPR or CAN-SPAM. Furthermore, if the newsletter content is dynamically generated based on user data, this could facilitate further information gathering for more targeted attacks against specific individuals within the subscriber base.
Mitigation strategies must prioritize immediate remediation of the access control logic. The most effective solution is to upgrade the SendPress Newsletters plugin to a version where these authorization checks have been properly implemented by the developers. Until an official patch is available, site administrators should restrict user registration and review existing accounts to ensure that no unauthorized users possess subscriber-level access if they do not require it for legitimate purposes. Additionally, implementing strict input validation and enforcing capability checks using WordPress functions such as current_user_can before executing any newsletter-related actions in custom code or patches can temporarily mitigate the risk. It is also advisable to monitor email send logs for unusual spikes in volume originating from non-administrative sources and to review API key permissions associated with external mailing services to limit potential blast radius in case of further exploitation.