CVE-2026-1051 is a medium-severity vulnerability affecting the WordPress plugin 'The Newsletter – Send awesome emails from WordPress'. This issue arises from Cross-Site Request Forgery (CSRF) vulnerabilities present in all versions up to and including 9.1.0. The flaw results from missing or incorrect nonce validation in the hook_newsletter_action() function. As such, unauthenticated attackers could leverage this vulnerability to unsubscribe newsletter subscribers if they can trick a logged-in user into clicking on a crafted link.
The vulnerability's CVSS score is 4.3, indicating a medium impact level. The attack vector is network-based, with low complexity, requiring no privileges and user interaction. The implication of this vulnerability is significant, as it allows attackers to manipulate newsletter subscriptions without the target's consent.
Organizations utilizing this plugin should prioritize patching immediately to prevent potential exploitation. The urgency arises from the fact that attackers may leverage social engineering tactics to exploit this vulnerability.
As of now, there is no confirmed public exploit, but the vulnerability is notable and should be addressed in the upcoming patch cycle.
Vulnerability Details
The vulnerability allows unauthenticated attackers to call the hook_newsletter_action() function without proper nonce validation, leading to unauthorized changes in newsletter subscriptions.
The CWE classification for this vulnerability is CWE-352, indicating the nature of the vulnerability as a Cross-Site Request Forgery.
Technical Analysis
The root cause of this vulnerability lies in the inadequate implementation of nonce validation in the plugin. This oversight enables an attacker to issue requests that can manipulate user subscriptions.
The attack vector is network-based, requiring an attacker to trick a logged-in user into clicking a malicious link. The attack complexity is categorized as low, as no special skills are required to exploit this vulnerability.
No privileges are required for the attacker, and user interaction is necessary, which means the user must be persuaded to click on a link for the attack to succeed. The vulnerability does not impact confidentiality or availability; however, it does have a low integrity impact, as it allows unauthorized changes to subscription settings.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized changes to newsletter subscriptions, which can lead to reputational damage and loss of trust from users. The blast radius includes all users of the affected plugin versions, making it crucial for organizations to address this vulnerability promptly.
Given the medium CVSS score of 4.3, organizations should address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of the 'The Newsletter – Send awesome emails from WordPress' plugin up to and including 9.1.0 are affected by this vulnerability. Organizations should ensure that they update to the latest version to mitigate this risk.
Mitigation & Remediation
Organizations should prioritize patching the plugin to the latest version available. Details regarding updates can typically be found on the official WordPress plugin repository. In the absence of a patch, consider implementing nonce validation in custom code to mitigate potential exploits.
For comprehensive security assessments, organizations may consider utilizing penetration testing services to identify and rectify similar vulnerabilities.
Detection Guidance
Organizations should monitor for any unusual subscription activity within their newsletters. Logging actions that modify user subscriptions can provide visibility into unauthorized changes. Additionally, keep an eye on user behavior anomalies, particularly those involving actions taken by authenticated users.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-1051 lies in the growing trend of CSRF vulnerabilities in web applications. It reflects a pattern where inadequate validation measures lead to exploitable conditions, emphasizing the need for rigorous security practices in plugin development.
Security teams should take lessons from this vulnerability to strengthen their coding practices and validation checks. Implementing robust nonce validation can mitigate risks associated with CSRF vulnerabilities.
For organizations interested in enhancing their security posture, consider exploring vulnerability management programs that ensure ongoing assessments and compliance.
Furthermore, for businesses deploying web applications, effective web application penetration testing can identify vulnerabilities before they can be exploited.
Lastly, organizations should maintain an active awareness of emerging vulnerabilities and updates in security practices by following relevant security blogs and resources.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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