CVE-2025-59413 in Cubecart
Summary
by MITRE • 09/22/2025
CubeCart is an ecommerce software solution. Prior to version 6.5.11, a logic flaw exists in the newsletter subscription endpoint that allows an attacker to unsubscribe any user without their consent. By changing the value of the force_unsubscribe parameter in the POST request to 1, an attacker can force the removal of any valid subscriber’s email address. This issue has been patched in version 6.5.11.
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Analysis
by VulDB Data Team • 09/22/2025
The vulnerability identified as CVE-2025-59413 represents a critical logic flaw within CubeCart's newsletter subscription endpoint that fundamentally compromises user consent and privacy controls. This ecommerce platform, widely used for online retail operations, contains a design flaw in its subscription management system that allows unauthorized manipulation of user email addresses. The vulnerability specifically affects versions prior to 6.5.11, indicating that this was a known issue that required immediate patching to prevent exploitation. The flaw resides in the validation logic of the newsletter endpoint, where the force_unsubscribe parameter can be manipulated to bypass normal subscription management protocols.
The technical implementation of this vulnerability stems from inadequate input validation and access control mechanisms within the newsletter subscription service. When an attacker sends a POST request to the newsletter endpoint with force_unsubscribe parameter set to 1, the system processes this request without proper authorization checks or user verification. This represents a classic case of insufficient authorization controls where the system fails to verify that the requestor has legitimate authority to perform the unsubscribe action. The vulnerability aligns with CWE-863, which addresses "Incorrect Authorization" issues where the system does not properly verify that an actor is authorized to perform a requested action. The flaw essentially allows for arbitrary user removal from subscription lists, creating potential privacy violations and user experience issues.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass broader security implications for ecommerce operations. Attackers can leverage this flaw to remove legitimate subscribers from newsletters, potentially disrupting customer communication channels and affecting marketing campaigns. The unauthorized removal of email addresses could also facilitate spamming attempts or social engineering attacks where compromised subscriber lists are used for malicious purposes. From an ATT&CK framework perspective, this vulnerability maps to T1566, which involves social engineering techniques, and T1190, which addresses exploitation of remote services. The ability to manipulate subscription lists without user consent creates opportunities for attackers to disrupt business operations and potentially gather intelligence about customer bases.
Organizations using affected versions of CubeCart face significant risks including potential compliance violations under data protection regulations such as GDPR or CCPA, where unauthorized modification of user subscription preferences could constitute regulatory breaches. The vulnerability also impacts user trust and platform reputation, as users may lose confidence in the security of their personal information. Security teams should prioritize immediate patching of all affected systems to prevent exploitation, while also monitoring for potential indicators of compromise such as unusual subscription removal patterns or unauthorized access attempts to newsletter management interfaces. The fix implemented in version 6.5.11 likely includes proper input validation, enhanced authorization checks, and verification mechanisms that ensure only legitimate users or authorized administrators can perform unsubscribe operations.