{"id":"CVE-2026-100716","state":"PUBLISHED","title":"Froxlor before 2.3.12 Privilege Escalation via Symlink","description":"Froxlor is a server administration panel. In versions 2.3.10 and earlier, the customer data-export (DataDump) cron fails to validate intermediate path components of the export destination: Froxlor\\FileDir::makeCorrectDir() contains an off-by-one in its path-component walk that skips the first segment below the customer home directory, and the guard in ExportCron.php checks only the final component with is_link(). An authenticated customer whose account has the export feature enabled can schedule an export into a genuine subdirectory of their own webspace, then replace an intermediate path component with a symlink before the root-owned cron runs. The cron's `chown -R` then recursively changes ownership of the linked directory tree — for example /etc — to the customer's UID, yielding host root and cross-tenant compromise. Exploitation is deterministic and requires no race. This is an incomplete fix of GHSA-75h4-... The issue is fixed in Froxlor 2.3.12.","publishedAt":"2026-09-26T13:24:07.854Z","updatedAt":"2026-09-28T14:41:06.103Z","severity":{"score":9.4,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","source":"VulnCheck"},"assigner":"VulnCheck","products":["froxlor froxlor"],"affected":[{"vendor":"froxlor","product":"froxlor","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.3.12","versionType":"semver"},{"version":"2.3.12","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/froxlor/froxlor/security/advisories/GHSA-2wjc-6mgx-hq42","https://www.vulncheck.com/advisories/froxlor-before-2.3.12-privilege-escalation-via-symlink"],"weaknesses":["CWE-59"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/100xxx/CVE-2026-100716.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100716","state":"PUBLISHED","datePublished":"2026-09-26T13:24:07.854Z","dateUpdated":"2026-09-28T14:41:06.103Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-26T02:40:56.225Z"},"containers":{"cna":{"title":"Froxlor before 2.3.12 Privilege Escalation via Symlink","descriptions":[{"lang":"en","value":"Froxlor is a server administration panel. In versions 2.3.10 and earlier, the customer data-export (DataDump) cron fails to validate intermediate path components of the export destination: Froxlor\\FileDir::makeCorrectDir() contains an off-by-one in its path-component walk that skips the first segment below the customer home directory, and the guard in ExportCron.php checks only the final component with is_link(). An authenticated customer whose account has the export feature enabled can schedule an export into a genuine subdirectory of their own webspace, then replace an intermediate path component with a symlink before the root-owned cron runs. The cron's `chown -R` then recursively changes ownership of the linked directory tree — for example /etc — to the customer's UID, yielding host root and cross-tenant compromise. Exploitation is deterministic and requires no race. This is an incomplete fix of GHSA-75h4-... The issue is fixed in Froxlor 2.3.12."}],"affected":[{"vendor":"froxlor","product":"froxlor","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.3.12","versionType":"semver"},{"version":"2.3.12","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/froxlor/froxlor/security/advisories/GHSA-2wjc-6mgx-hq42","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-2wjc-6mgx-hq42)"},{"url":"https://www.vulncheck.com/advisories/froxlor-before-2.3.12-privilege-escalation-via-symlink","name":"VulnCheck Advisory: Froxlor before 2.3.12 Privilege Escalation via Symlink","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","baseScore":9.4,"baseSeverity":"CRITICAL","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","exploitMaturity":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.9,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-59","lang":"en","description":"Improper Link Resolution Before File Access ('Link Following')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-26T13:24:07.854Z"},"datePublic":"2026-09-06T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:froxlor:froxlor:*:*:*:*:*:*:*:*","versionEndExcluding":"2.3.12"}]}]}],"credits":[{"lang":"en","value":"skeletonsec","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/froxlor/froxlor/security/advisories/GHSA-2wjc-6mgx-hq42","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-28T14:40:34.238165Z","id":"CVE-2026-100716","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-28T14:41:06.103Z"}}]}}}