CVE-2026-18736: Shlink 2.6.0 through 5.1.5

CVE-2026-18736. CVSS 3.1 base score 5.0 (MEDIUM, Vendor/CNA). EPSS 0.00305 (percentile 0.22061), scored 22-Oct-2026.

Affected technology

Shlink · 2.6.0 through 5.1.5
shlinkio

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

Attackers can submit URLs pointing to public hosts that redirect to internal targets, including loopback addresses, link-local ranges, and cloud metadata endpoints such as 169.254.169.254, to exfiltrate internal service information via the HTML title element returned in the short URL creation response. Vendor/CNA’s CVSS 4.0 assessment (base score 5.3/10) rates confidentiality impact as low; integrity and availability impact as none.

Published 24-Oct-2026 01:44 UTC

CWE: CWE-918
CCR priority: 20.1 /100 (P4)
CVSS 3.1: 5.0 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N · Vendor/CNA
EPSS: 0.00305 · percentile 0.22061 · 2026-10-22
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-24 01:40:49.068977+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-18736.html