s9y Serendipity up to 2.6.0 Exit exit.php url redirect

Summaryinfo

A vulnerability, which was classified as problematic, was found in s9y Serendipity up to 2.6.0. Affected by this issue is some unknown functionality of the file exit.php of the component Exit Handler. Such manipulation of the argument url leads to redirect. This vulnerability is referenced as CVE-2026-67350. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in s9y Serendipity up to 2.6.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file exit.php of the component Exit Handler. The manipulation of the argument url 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:

Serendipity before 2.6.1 contains an open redirect vulnerability in exit.php that allows unauthenticated attackers to redirect users to arbitrary external sites by supplying a malicious Base64-encoded url parameter when the Track Exits plugin is configured with commentredirection set to s9y. Attackers can craft trusted-looking URLs leveraging the legitimate blog domain to conduct phishing, deliver malware, or bypass URL reputation filters.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-67350 since 07/29/2026. 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. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1204.001.

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

Upgrading to version 2.6.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-51552). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• s9y

Name

• Serendipity

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6.0

License

• free

Website

• Product: https://github.com/s9y/Serendipity/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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