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CVE-2026-111720— fish-island-backend through commit 7c61b78 SSRF via /api/web/parse

Quick assessment

Affected
lhccong fish-island-backend
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

fish-island-backend 项目截至提交 7c61b78 存在未认证的服务器端请求伪造（SSRF）漏洞。该漏洞允许远程攻击者通过 GET /api/web/parse 接口中的 url 参数，诱导服务器发起对攻击者指定 URL 的请求。攻击者可利用支持自动跟随重定向的 OkHttp 请求，针对内部主机、回环服务或云元数据端点发起攻击，并读取返回页面的标题、元描述（meta description）及网站图标（favicon）等信息。

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
lhccong fish-island-backend ≤ 7c61b7861e99d3970beb34103c244b79e4de7d88 affected
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I. Basic Information for CVE-2026-111720

Vulnerability Information
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Vulnerability Title
fish-island-backend through commit 7c61b78 SSRF via /api/web/parse
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lhccong fish-island-backend 0 ~ 7c61b7861e99d3970beb34103c244b79e4de7d88 -

II. Public POCs for CVE-2026-111720

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-111720

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Vendor Advisories for CVE-2026-111720 (1)

Proof of Concept for CVE-2026-111720 (2)

Security Blog Posts for CVE-2026-111720 (1)

IV. Related Vulnerabilities

Same weakness: CWE-918

V. Comments for CVE-2026-111720

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