CVE-2026-67350

Medium

Description

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.

SeverityMedium

CVSS4.3

Exploit probability—

Product

Serendipity

PublishedJul 31, 2026

First seenJul 31, 2026

Weakness typeCWE-601Open redirect

How to fix

Update

s9y Serendipity2.6.1 or later

Vendor advisories

github.com/s9y/Serendipity/security/advisories/GHSA-77rw-27c5-4hxm

Affected products

Product	Affected versions	Fixed in
s9y Serendipity	v < 2.6.1	2.6.1

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