{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-12503","assignerOrgId":"455daabc-a392-441d-aa46-37d35189897c","state":"PUBLISHED","assignerShortName":"NCSC.ch","dateReserved":"2026-06-17T09:48:11.206Z","datePublished":"2026-07-24T13:57:56.691Z","dateUpdated":"2026-07-24T14:57:47.202Z"},"containers":{"cna":{"providerMetadata":{"orgId":"455daabc-a392-441d-aa46-37d35189897c","shortName":"NCSC.ch","dateUpdated":"2026-07-24T13:57:56.691Z"},"title":"Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-59","description":"CWE-59 Improper link resolution before file access ('link following')","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-122","descriptions":[{"lang":"en","value":"CAPEC-122 Privilege Abuse"}]},{"capecId":"CAPEC-233","descriptions":[{"lang":"en","value":"CAPEC-233 Privilege Escalation"}]}],"affected":[{"vendor":"Loytec","product":"LIP-ME20xC","versions":[{"status":"affected","version":"0","lessThanOrEqual":"8.4.16","versionType":"custom"}],"defaultStatus":"unaffected"},{"vendor":"Loytec","product":"L-INX","versions":[{"status":"affected","version":"0","lessThanOrEqual":"8.4.16","versionType":"custom"}],"defaultStatus":"unaffected"},{"vendor":"Loytec","product":"L-GATE","versions":[{"status":"affected","version":"0","lessThanOrEqual":"8.4.16","versionType":"custom"}],"defaultStatus":"unaffected"},{"vendor":"Loytec","product":"L-ROC","versions":[{"status":"affected","version":"0","lessThanOrEqual":"8.4.16","versionType":"custom"}],"defaultStatus":"unaffected"},{"vendor":"Loytec","product":"L-IOB","versions":[{"status":"affected","version":"0","lessThanOrEqual":"8.4.16","versionType":"custom"}],"defaultStatus":"unaffected"},{"vendor":"Loytec","product":"L-DALI","versions":[{"status":"affected","version":"0","lessThanOrEqual":"8.4.16","versionType":"custom"}],"defaultStatus":"unaffected"},{"vendor":"Loytec","product":"L-VIS","versions":[{"status":"affected","version":"0","lessThanOrEqual":"8.4.16","versionType":"custom"}],"defaultStatus":"unaffected"},{"vendor":"Loytec","product":"L-PAD","versions":[{"status":"affected","version":"0","lessThanOrEqual":"8.4.16","versionType":"custom"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"Improper Link Resolution (CWE-59) in `/usr/bin/larm_starter` in Loytec L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an authenticated `larmapp` attacker to make `/etc/passwd` writable by the `larmapp` group (leading to root privilege escalation) via a symlink attack on `/etc/lighttpd/ssl/server.pem`.","supportingMedia":[{"type":"text/html","base64":false,"value":"Improper Link Resolution (CWE-59) in `/usr/bin/larm_starter` in Loytec L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an authenticated `larmapp` attacker to make `/etc/passwd` writable by the `larmapp` group (leading to root privilege escalation) via a symlink attack on `/etc/lighttpd/ssl/server.pem`."}]}],"references":[{"url":"https://www.loytec.com/support/product-security/advisories/8520-dibt-cve-20260526-0002-symlink-following-in-chown-chmod-critical","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"CRITICAL","baseScore":9.2,"vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:H/SA:N"}}],"solutions":[{"lang":"en","value":"Upgrade to firmware 8.4.18.","supportingMedia":[{"type":"text/html","base64":false,"value":"Upgrade to firmware 8.4.18."}]}],"credits":[{"lang":"en","value":"Daniel Hulliger, armasuisse CYD Campus","type":"finder"},{"lang":"en","value":"Damian Pfammatter, armasuisse CYD Campus","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-24T14:57:37.633031Z","id":"CVE-2026-12503","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-24T14:57:47.202Z"}}]}}