PT-2026-66760 · S9Y · Serendipity

Vaibhav Kubade · CVE-2026-67350 · Published 2026-07-31 · Updated 2026-07-31

NVD

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

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.

Fix

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

CVE-2026-67350

Affected Products

Serendipity

References · 3

• https://github.com/s9y/Serendipity/security/advisories/GHSA-77rw-27c5-4hxm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-67350 · Security Note
• https://vulncheck.com/advisories/serendipity-open-redirect-via-exit-php · Note