CVE-2026-67350

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 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 Software

Weaknesses

• CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

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

References

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

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