{"id":"CVE-2026-18115","state":"PUBLISHED","title":"In Concrete CMS 9.2.0 to 9.5.2, Missing Authorization in REST API Users update() and change_password Enables Account Takeover.","description":"Concrete CMS 9.2.0 to 9.5.2 did not enforce per-field edit_user_properties permissions on the REST API user write endpoints (PUT /ccm/api/1.0/users/{uID} and POST /ccm/api/1.0/users/{uID}/change_password). A user with an update-scoped OAuth token and permission to edit only one non-sensitive field could change another non-superuser's password, username, email, and attributes, taking over that account. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.4 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.","publishedAt":"2026-09-15T17:39:04.359Z","updatedAt":"2026-09-15T19:18:12.049Z","severity":{"score":7.4,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","source":"ConcreteCMS"},"assigner":"ConcreteCMS","products":["Concrete CMS Concrete CMS"],"affected":[{"vendor":"Concrete CMS","product":"Concrete CMS","defaultStatus":"unaffected","versions":[{"version":"9.2.0","status":"affected","lessThanOrEqual":"9.5.2","versionType":"git"}],"collectionURL":"https://github.com/concretecms/concretecms","repo":"https://github.com/concretecms/concretecms"}],"references":["https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/18xxx/CVE-2026-18115.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-18115","state":"PUBLISHED","datePublished":"2026-09-15T17:39:04.359Z","dateUpdated":"2026-09-15T19:18:12.049Z","assignerShortName":"ConcreteCMS","assignerOrgId":"ff5b8ace-8b95-4078-9743-eac1ca5451de","dateReserved":"2026-07-28T18:01:58.197Z"},"containers":{"cna":{"title":"In Concrete CMS 9.2.0 to 9.5.2, Missing Authorization in REST API Users update() and change_password Enables Account Takeover.","descriptions":[{"lang":"en","value":"Concrete CMS 9.2.0 to 9.5.2 did not enforce per-field edit_user_properties permissions on the REST API user write endpoints (PUT /ccm/api/1.0/users/{uID} and POST /ccm/api/1.0/users/{uID}/change_password). A user with an update-scoped OAuth token and permission to edit only one non-sensitive field could change another non-superuser's password, username, email, and attributes, taking over that account. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.4 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting."}],"affected":[{"vendor":"Concrete CMS","product":"Concrete CMS","defaultStatus":"unaffected","versions":[{"version":"9.2.0","status":"affected","lessThanOrEqual":"9.5.2","versionType":"git"}],"collectionURL":"https://github.com/concretecms/concretecms","repo":"https://github.com/concretecms/concretecms"}],"references":[{"url":"https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes","tags":["release-notes"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","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":"HIGH","baseScore":7.4,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862 Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"ConcreteCMS","orgId":"ff5b8ace-8b95-4078-9743-eac1ca5451de","dateUpdated":"2026-09-15T17:39:04.359Z"},"impacts":[{"capecId":"CAPEC-58","descriptions":[{"lang":"en","value":"CAPEC-58 Restful Privilege Elevation"}]},{"capecId":"CAPEC-122","descriptions":[{"lang":"en","value":"CAPEC-122 Privilege Abuse"}]}],"credits":[{"lang":"en","value":"riodrwn","type":"finder"}],"source":{"defect":["HackerOne"],"advisory":"3799320","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T19:18:00.746001Z","id":"CVE-2026-18115","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T19:18:12.049Z"}}]}}}