{"id":"CVE-2026-88592","title":"kkFileView >= 4.2.0 is vulnerable to Server-Side Request Forgery (SSRF)","summary":"kkFileView >= 4.2.0 is vulnerable to Server-Side Request Forgery (SSRF). The cross-origin file proxy endpoint /getCorsFile is protected by TrustHostFilter against the trust.host whitelist. However, the URL parameter validated by the filt…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-345"],"published":"2026-09-16","updated":"2026-09-22","sourceUpdated":"2026-09-22T20:00:03.713","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88592","references":[{"url":"https://github.com/sg-summer/cve/issues/2","label":"cve@mitre.org"},{"url":"https://github.com/sg-summer/cve/issues/2","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00211,"epssPercentile":0.10148,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-17T19:33:08.117968Z"},"ingestedAt":"2026-09-16T20:03:30.762Z","slug":"CVE-2026-88592","body":"## Overview\n\nkkFileView >= 4.2.0 is vulnerable to Server-Side Request Forgery (SSRF). The cross-origin file proxy endpoint /getCorsFile is protected by TrustHostFilter against the trust.host whitelist. However, the URL parameter validated by the filter is not the same parameter the controller actually fetches: the filter validates the first non-empty parameter in a fixed priority order, while the controller only reads and fetches urlPath. By supplying both urlPath=<real target> and url=<whitelisted decoy address> in the same request, the decoy passes validation while the unvalidated real target is fetched server-side — and the response body is echoed back to the attacker.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":62,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":206574,"id":"CVE-2026-88592","ts":1789676933181,"field":"exploit_available","old":"false","new":"true"},{"seq":206573,"id":"CVE-2026-88592","ts":1789676933181,"field":"cvss","old":null,"new":"9.1"},{"seq":206572,"id":"CVE-2026-88592","ts":1789676933181,"field":"severity","old":"none","new":"critical"}]}