CVE-2026-1073 in Purchase Button for Affiliate Link Plugin
Summary
by MITRE • 03/07/2026
The Purchase Button For Affiliate Link plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0.2. This is due to missing nonce validation on the settings page form handler in `inc/purchase-btn-options-page.php`. This makes it possible for unauthenticated attackers to modify plugin settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 03/08/2026
The vulnerability identified as CVE-2026-1073 affects the Purchase Button For Affiliate Link plugin for WordPress, specifically targeting versions up to and including 1.0.2. This represents a critical security flaw that undermines the integrity of the plugin's administrative functionality. The vulnerability stems from insufficient input validation mechanisms within the plugin's settings page form handler, creating an exploitable condition that allows unauthorized modifications to critical plugin configurations. The flaw exists in the file `inc/purchase-btn-options-page.php` where the necessary security checks are absent, making the plugin susceptible to malicious exploitation attempts.
The technical implementation of this vulnerability involves the absence of nonce validation within the plugin's administrative interface. Nonce validation serves as a cryptographic token that ensures requests originate from legitimate administrative sessions and prevents unauthorized modifications to system settings. Without this crucial security measure, attackers can craft malicious requests that appear to come from authenticated administrators, effectively bypassing the normal authentication and authorization processes. This particular implementation flaw aligns with CWE-352, which specifically addresses Cross-Site Request Forgery vulnerabilities in web applications. The vulnerability creates a scenario where an attacker can manipulate plugin configurations without requiring valid credentials or authentication tokens, essentially granting them administrative control over the affected plugin's settings.
The operational impact of this vulnerability extends beyond simple configuration changes, as it creates a persistent threat vector that can be exploited by unauthenticated attackers. An attacker can construct a malicious payload that, when executed by an authenticated administrator, modifies the plugin's behavior and potentially redirects affiliate links to malicious destinations. This type of attack can lead to financial losses for the website owner, as affiliate commissions may be redirected to unauthorized parties, or it could be used to inject malicious content into the website's affiliate marketing functionality. The vulnerability also creates opportunities for data exfiltration, as modified plugin settings could be configured to send sensitive information to external servers. This attack vector particularly concerns security professionals because it can be executed through social engineering techniques, making it difficult to detect and prevent.
Mitigation strategies for this vulnerability should focus on immediate remediation through plugin updates to versions that include proper nonce validation mechanisms. System administrators should ensure that all WordPress plugins are regularly updated and maintained to address known security vulnerabilities. The implementation of additional security measures such as web application firewalls and monitoring systems can help detect and prevent exploitation attempts. Security professionals should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts. The vulnerability demonstrates the critical importance of following secure coding practices, particularly in the implementation of administrative interfaces where proper authentication and authorization mechanisms must be enforced. Organizations should conduct regular security assessments of their WordPress installations to identify and remediate similar vulnerabilities that may exist within other plugins or themes. This particular flaw serves as a reminder of the ATT&CK framework's relevance in understanding how attackers can leverage web application vulnerabilities to achieve persistent access and control over systems.