What’s Vulnerable › Vulnerabilities

CVE-2026-67350: Serendipity < 2.6.1 Open Redirect via exit.php

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-31 · updated 2026-10-23
• Weakness: CWE-601

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.

Affected products

• s9y Serendipity: before 2.6.1 — fixed in 2.6.1

How to fix

Upgrade to a fixed version: s9y Serendipity 2.6.1. Check the vendor advisory for mitigations.

References

• https://github.com/s9y/Serendipity/security/advisories/GHSA-77rw-27c5-4hxm
• https://www.vulncheck.com/advisories/serendipity-open-redirect-via-exit-php
• https://github.com/s9y/Serendipity/security/advisories/GHSA-77rw-27c5-4hxm

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