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CVE-2026-18737: Shlink 3.3.1 through 5.1.5
CVE-2026-18737. CVSS 3.1 base score 6.5 (MEDIUM, Vendor/CNA). EPSS 0.00301 (percentile 0.21629), scored 22-Oct-2026.
Affected technology
Shlink · 3.3.1 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 craft a malicious direction string containing SQL subqueries that flows unsanitized into a Doctrine QueryBuilder ORDER BY clause, enabling time-based, boolean-oracle, and error-based extraction of sensitive data including long URLs, visitor records, IP addresses, geolocation data, user agents, and hashed API key secrets from any tenant. Vendor/CNA’s CVSS 4.0 assessment (base score 7.1/10) rates confidentiality impact as high; integrity and availability impact as none.
- CWE
- CWE-89
- CCR priority
- 26.1 /100 (P4)
- CVSS 3.1
- 6.5 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N · Vendor/CNA
- EPSS
- 0.00301 · percentile 0.21629 · 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-2026-18737.html