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CVE-2026-111720 lhccong CVE debrief

CVE-2026-111720 is a server-side request forgery vulnerability in fish-island-backend through commit 7c61b78. This vulnerability allows remote attackers to make the server fetch attacker-supplied URLs via the url parameter of GET /api/web/parse. The vulnerability has a CVSS score of 6.9 and is classified as MEDIUM severity. Defenders should verify exposure of the /api/web/parse endpoint and ensure that the server does not fetch unintended URLs. This can be achieved by reviewing the system's configuration and monitoring for suspicious activity. Additionally, defenders should consider implementing compensating controls, such as IP filtering or URL whitelisting, to prevent potential 6

Vendor
lhccong
Product
fish-island-backend
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-16
Original CVE updated
2026-10-19
Advisory published
2026-10-16
Advisory updated
2026-10-19

Who should care

Defenders who are responsible for the security of the fish-island-backend system should care about this vulnerability. They should verify exposure of the /api/web/parse endpoint and ensure that the server does not fetch unintended URLs.

Why it matters

CVE-2026-111720 is a server-side request forgery vulnerability in fish-island-backend through commit 7c61b78, which allows remote attackers to make the server fetch attacker-supplied URLs via the url parameter of GET /api/web/parse. Defenders should prioritize verifying exposure of the /api/web/parse endpoint and ensuring that the server does not fetch unintended URLs.

  • Defenders need to verify exposure of the /api/web/parse endpoint to prevent unintended URL fetching.
  • Defenders should monitor for suspicious activity on the /api/web/parse endpoint to detect potential attacks.
  • Defenders need to ensure that the server does not fetch unintended URLs to prevent potential security breaches.

Technical summary

The vulnerability is caused by the lack of authentication in the /api/web/parse endpoint, which allows remote attackers to make the server fetch attacker-supplied URLs. The vulnerability can be exploited by sending a GET request to the /api/web/parse endpoint with a URL parameter. This can lead to unauthorized access to internal hosts, loopback services, or cloud metadata endpoints. Defenders should prioritize verifying exposure of the /api/web/parse endpoint and ensuring that the server does not fetch unintended URLs. This can be achieved by reviewing the system's configuration and monitoring for suspicious 8

Defensive priority

Defenders should prioritize verifying exposure of the /api/web/parse endpoint and ensuring that the server does not fetch unintended URLs.

Recommended defensive actions

  • Verify exposure of the /api/web/parse endpoint
  • Ensure that the server does not fetch unintended URLs
  • Monitor for suspicious activity on the /api/web/parse endpoint
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is described in the CVE Program record and the NVD vulnerability detail page. The source item provides additional information about the vulnerability, including technical descriptions and references.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-111720 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-111720

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-111720 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-111720

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

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

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/111xxx/CVE-2026-111720.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://hackmd.io/@hieuPenguinnn/fish-island-web-parse-unauth-ssrf

    Supplemental source - third-party-advisory

  • Source reference

    Unverified legacy reference

    URL: https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/service/impl/chat/WebParserServiceImpl.java

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/controller/chat/WebParserController.java

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://github.com/lhccong/fish-island-backend/blob/7c61b7861e99d3970beb34103c244b79e4de7d88/src/main/java/com/cong/fishisland/config/CorsConfig.java

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/fish-island-backend-through-commit-7c61b78-ssrf-via-api-web-parse

    Supplemental source - third-party-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.