---
id: CVE-2026-67350
title: >-
  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 p…
summary: >-
  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 p…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-601
published: '2026-07-31'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:35:08.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67350'
references:
  - url: 'https://github.com/s9y/Serendipity/security/advisories/GHSA-77rw-27c5-4hxm'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/serendipity-open-redirect-via-exit-php
    label: disclosure@vulncheck.com
  - url: 'https://github.com/s9y/Serendipity/security/advisories/GHSA-77rw-27c5-4hxm'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00348
epssPercentile: 0.2569
ingestedAt: '2026-08-02T00:16:16.100Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.