{"id":"CVE-2026-3987","state":"PUBLISHED","title":"WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI","description":"A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.","publishedAt":"2026-04-01T21:32:30.426Z","updatedAt":"2026-08-10T16:46:12.527Z","severity":{"score":8.6,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"WatchGuard"},"assigner":"WatchGuard","products":["WatchGuard Fireware OS"],"affected":[{"vendor":"WatchGuard","product":"Fireware OS","defaultStatus":"unaffected","versions":[{"version":"2025.1","status":"affected","lessThan":"2026.2","versionType":"custom"},{"version":"12.6.1","status":"affected","lessThan":"12.12","versionType":"custom"}]}],"references":["https://psirt.watchguard.com/CVE-2026-3987","https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009"],"weaknesses":["CWE-22"],"ingestedAt":"2026-10-29T20:11:50.837Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/3xxx/CVE-2026-3987.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-3987","state":"PUBLISHED","datePublished":"2026-04-01T21:32:30.426Z","dateUpdated":"2026-08-10T16:46:12.527Z","assignerShortName":"WatchGuard","assignerOrgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","dateReserved":"2026-03-11T15:01:46.222Z"},"containers":{"cna":{"title":"WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI","descriptions":[{"lang":"en","value":"A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process."}],"affected":[{"vendor":"WatchGuard","product":"Fireware OS","defaultStatus":"unaffected","versions":[{"version":"2025.1","status":"affected","lessThan":"2026.2","versionType":"custom"},{"version":"12.6.1","status":"affected","lessThan":"12.12","versionType":"custom"}]}],"references":[{"url":"https://psirt.watchguard.com/CVE-2026-3987","tags":["vendor-advisory"]},{"url":"https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009","tags":["vendor-advisory"]}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","baseScore":8.6,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","description":"CWE-22","type":"CWE"}]}],"providerMetadata":{"shortName":"WatchGuard","orgId":"5d1c2695-1a31-4499-88ae-e847036fd7e3","dateUpdated":"2026-08-10T16:46:12.527Z"},"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionStartIncluding":"2025.1","versionEndExcluding":"2026.2"},{"vulnerable":true,"criteria":"cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*","versionStartIncluding":"12.6.1","versionEndExcluding":"12.12"}]}]}],"credits":[{"lang":"en","value":"btaol","type":"finder"}],"solutions":[{"lang":"en","value":"Fireware OS 2026.2, Fireware OS 12.12"}],"exploits":[{"lang":"en","value":"WatchGuard is not aware of any exploitation of this issue in the wild."}],"datePublic":"2026-04-01T21:32:30.426Z"},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-02T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-3987"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-03T03:55:30.681Z"}}]}}}