fish-island-backend through commit 7c61b78 SSRF via /api/web/parse

Advisories

fish-island-backend through commit 7c61b78 SSRF via /api/web/parse

Severity: medium
Date: 10/16/2026
Affecting: fish-island-backend <= 7c61b7861e99d3970beb34103c244b79e4de7d88
CVE: CVE-2026-111720
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References: https://hackmd.io/@hieuPenguinnn/fish-island-web-parse-unauth-ssrf
https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/service/impl/chat/WebParserServiceImpl.java#L28-L45
https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/controller/chat/WebParserController.java#L13-L25
https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/config/CorsConfig.java#L33
Credit: hieuPenguinnn
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.

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