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TI-2026-47646 Aliases CVE-2026-67350GHSA-xcqg-793j-q344

Serendipity < 2.6.1 Open Redirect via exit.php

Priority MEDIUM 44CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
Present
Impact type
Spoofing
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-601.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00348 28th percentileScored 2026-11-07
Fix Fixed Serendipity (s9y): 2.6.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
s9ySerendipitybefore 2.6.12.6.1Patch availableCNA
  • Serendipity Vendors9y Affected before 2.6.1 Fixed in 2.6.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:s9y:serendipity:*:*:*:*:*:*:*:*——s9y
  • cpe:2.3:a:s9y:serendipity:*:*:*:*:*:*:*:* Versions — — ·s9y

Remediation

  • Fix · CNA Serendipity (s9y) Fixed in 2.6.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-67350
  2. 2026-10-03 Alias added: GHSA-xcqg-793j-q344

References

Advisory 1

  • TI-2026-47647 Serendipity < 2.6.1 Authentication Bypass via Username Collision CVSS 4.0HIGH 8.7
  • TI-2023-30216 Serendipity 2.4.0 Authenticated Remote Code Execution via File Upload CVSS 4.0HIGH 8.7
  • TI-2024-38379 Serendipity 2.5.0 Remote Code Execution via Authenticated Media Upload CVSS 4.0HIGH 8.6
  • TI-2026-28827 Serendipity: Host Header Injection leads to SMTP header injection via unvalidated HTTP_HOST CVSS 3.1HIGH 7.2
  • TI-2026-28819 Serendipity: Host Header Injection enables authentication cookie scoping to an attacker-controlled domain CVSS 3.1MEDIUM 6.9
  • TI-2026-51712 Serendipity 2.3.5 Reflected XSS via search clean-URL route CVSS 4.0MEDIUM 5.3
See all 64 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences