Mautic up to 6.0.1/5.2.5/4.4.15 0 endpoint returnUrl redirect

Summaryinfo

A vulnerability was found in Mautic up to 6.0.1/5.2.5/4.4.15 and classified as problematic. Affected by this issue is some unknown functionality of the file /s/action/unlock/user.user/0 endpoint. Such manipulation of the argument returnUrl leads to redirect. This vulnerability is traded as CVE-2025-5256. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mautic up to 6.0.1/5.2.5/4.4.15. It has been rated as problematic. Affected by this issue is an unknown code of the file /s/action/unlock/user.user/0 endpoint. The manipulation of the argument returnUrl with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. CVE summarizes:

SummaryThis advisory addresses an Open Redirection vulnerability in Mautic's user unlocking endpoint. This vulnerability could be exploited by an attacker to redirect legitimate users to malicious websites, potentially leading to phishing attacks or the delivery of exploit kits. Open Redirection via returnUrl Parameter: An Open Redirection vulnerability exists in the /s/action/unlock/user.user/0 endpoint. The returnUrl parameter, intended for post-action redirection, is not properly validated. This allows an attacker to craft a URL that, when clicked by a user, redirects them to an arbitrary external website controlled by the attacker. MitigationUpdate Mautic to a version that properly validates or sanitizes the returnUrl parameter to ensure that redirects only occur to trusted, internal URLs or explicitly whitelisted domains.

The advisory is available at github.com. This vulnerability is handled as CVE-2025-5256 since 05/27/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

Upgrading to version 6.0.2, 5.2.6 or 4.4.16 eliminates this vulnerability.

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Productinfo

Name

• Mautic

Version

• 4.4.0
• 4.4.1
• 4.4.2
• 4.4.3
• 4.4.4
• 4.4.5
• 4.4.6
• 4.4.7
• 4.4.8
• 4.4.9
• 4.4.10
• 4.4.11
• 4.4.12
• 4.4.13
• 4.4.14
• 4.4.15
• 5.2.0
• 5.2.1
• 5.2.2
• 5.2.3
• 5.2.4
• 5.2.5
• 6.0.0
• 6.0.1

License

• open-source

Website

• Product: https://github.com/mautic/mautic/

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