Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck
CVE-2026-111720fish-island-backend through commit 7c61b78 SSRF via /api/web/parse
Medium 5.3
In plain English
A medium-severity server-side request forgery in fish-island-backend from lhccong. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| lhccong | fish-island-backend | 0 – through 7c61b7861e99d3970beb34103c244b79e4de7d88 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- https://hackmd.io/@hieuPenguinnn/fish-island-web-parse-unauth-ssrf third-party-advisory
- https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/service/impl/chat/WebParserServiceImpl.java#L28-L45 technical-description
- https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/controller/chat/WebParserController.java#L13-L25 technical-description
- https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/config/CorsConfig.java#L33 technical-description
- VulnCheck Advisory: fish-island-backend through commit 7c61b78 SSRF via /api/web/parse third-party-advisory