Cotonti up to 1.0.0 Redirect message.php redirect

Summaryinfo

A vulnerability classified as problematic was found in Cotonti up to 1.0.0. The impacted element is an unknown function of the file message.php of the component Redirect. Executing a manipulation of the argument redirect can lead to redirect. The identification of this vulnerability is CVE-2026-100523. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Cotonti up to 1.0.0 and classified as problematic. This vulnerability affects an unknown function of the file message.php of the component Redirect. The manipulation of the argument redirect with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

Cotonti through 1.0.0 contains an open redirect vulnerability in message.php that base64-decodes the redirect parameter without domain validation. Unauthenticated attackers can craft malicious links with encoded external URLs to redirect users to arbitrary sites via meta refresh tags for phishing attacks.

The advisory is available at github.com. This vulnerability was named CVE-2026-100523 since 09/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/26/2026). This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

By approaching the search of inurl:message.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• Cotonti

Version

• 1.0

Website

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

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