SSRF in Lhccong Fish-Island-Backend
CVE-2026-111720
fish-island-backend through commit 7c61b78 contains an unauthenticated server-side request forgery vulnerability that allows remote attackers to make the server fetch attacker-supplied URLs via the url parameter of GET /api/web/parse. Attackers can target internal hosts, loopback services or cloud metadata endpoints through redirect-following OkHttp requests and read back page titles, meta descriptions and favicons.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/fish-island-web-parse-unauth-ssrf (third-party-advisory)
- github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4d… (technical-description)
- github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4d… (technical-description)
- github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4d… (technical-description)
- www.vulncheck.com/advisories/fish-island-backend-through-commit-7c61b78-ssrf-vi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111720?
- CVE-2026-111720 is a medium-severity vulnerability in Lhccong Fish-Island-Backend, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.3/10. Published 2026-10-16.
- How severe is CVE-2026-111720?
- Medium severity. CVSS v3 base score is 5.3 out of 10.