{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-49973: Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-49973","status":"final","version":"1","initial_release_date":"2026-06-11T19:04:08.505Z","current_release_date":"2026-06-13T02:37:59.948Z","revision_history":[{"date":"2026-06-11T19:04:08.505Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-49973 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-49973"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-49973"},{"category":"external","summary":"github.com","url":"https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358"},{"category":"external","summary":"github.com","url":"https://github.com/nesquena/hermes-webui/pull/3964"},{"category":"external","summary":"github.com","url":"https://github.com/nesquena/hermes-webui/pull/3973"},{"category":"external","summary":"github.com","url":"https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08"},{"category":"external","summary":"vulncheck.com","url":"https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings"}]},"product_tree":{"branches":[{"category":"vendor","name":"nesquena","branches":[{"category":"product_name","name":"hermes-webui","branches":[{"category":"product_version_range","name":"<0.51.358","product":{"name":"nesquena hermes-webui <0.51.358","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:nesquena:hermes-webui:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-49973","title":"Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings","notes":[{"category":"description","text":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","baseScore":9.2,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 0.51.358.","product_ids":["CSAFPID-1"],"url":"https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08"}]}]}