{"id":"CVE-2026-42609","state":"PUBLISHED","title":"Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic","description":"Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2.","publishedAt":"2026-05-11T15:03:38.296Z","updatedAt":"2026-05-14T17:56:41.506Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["getgrav grav"],"affected":[{"vendor":"getgrav","product":"grav","versions":[{"version":"< 2.0.0-beta.2","status":"affected"}]}],"references":["https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8","https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663","https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47","https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632"],"weaknesses":["CWE-269","CWE-285","CWE-639","CWE-837"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42609.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42609","state":"PUBLISHED","datePublished":"2026-05-11T15:03:38.296Z","dateUpdated":"2026-05-14T17:56:41.506Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-29T00:31:15.725Z"},"containers":{"cna":{"title":"Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic","descriptions":[{"lang":"en","value":"Grav is a file-based Web platform. Prior to 2.0.0-beta.2, a business logic vulnerability in the Grav Admin Panel allows a low-privileged user (with only user creation permissions) to overwrite existing accounts, including the primary administrator. By creating a new user with a username that already exists, the system updates the existing account's metadata and permissions instead of rejecting the request. This leads to a Denial of Service (DoS) on administrative functions and Privilege De-escalation of the root account. This vulnerability is fixed in 2.0.0-beta.2."}],"affected":[{"vendor":"getgrav","product":"grav","versions":[{"version":"< 2.0.0-beta.2","status":"affected"}]}],"references":[{"url":"https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8","name":"https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663","name":"https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663","tags":["x_refsource_MISC"]},{"url":"https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47","name":"https://github.com/getgrav/grav/commit/c66dfeb5ff679a1667678c6335eb9ff3255dfc47","tags":["x_refsource_MISC"]},{"url":"https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632","name":"https://github.com/getgrav/grav/commit/d904efc33e03ebb597afde8d3368b28cf0423632","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-269","lang":"en","description":"CWE-269: Improper Privilege Management","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-285","lang":"en","description":"CWE-285: Improper Authorization","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-837","lang":"en","description":"CWE-837: Improper Enforcement of a Single, Unique Action","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-11T15:03:38.296Z"},"source":{"advisory":"GHSA-rr73-568v-28f8","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/getgrav/grav/security/advisories/GHSA-rr73-568v-28f8","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-14T17:56:12.800871Z","id":"CVE-2026-42609","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-14T17:56:41.506Z"}}]}}}