{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-3240","assignerOrgId":"ff5b8ace-8b95-4078-9743-eac1ca5451de","state":"PUBLISHED","assignerShortName":"ConcreteCMS","dateReserved":"2026-02-26T01:42:11.496Z","datePublished":"2026-03-04T02:15:53.400Z","dateUpdated":"2026-03-04T15:33:21.842Z"},"containers":{"cna":{"affected":[{"collectionURL":"https://github.com/concretecms/concretecms","defaultStatus":"unaffected","product":"Concrete CMS","repo":"https://github.com/concretecms/concretecms","vendor":"Concrete CMS","versions":[{"lessThan":"9.4.8","status":"affected","version":"5","versionType":"git"}]}],"credits":[{"lang":"en","type":"finder","value":"minhnn42, namdi and quanlna2 from VCSLab-Viettel Cyber Security"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<span style=\"background-color: rgb(255, 255, 255);\">In Concrete CMS below version 9.4.8, a&nbsp;</span><span style=\"background-color: rgb(255, 255, 255);\">user with permission to edit a page with element</span> Legacy form <span style=\"background-color: rgb(255, 255, 255);\">can perform a stored XSS attack towards high-privilege accounts via the&nbsp;</span>Question<span style=\"background-color: rgb(255, 255, 255);\"> field.&nbsp;The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector&nbsp;CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Thanks&nbsp;minhnn42, namdi and quanlna2 from VCSLab-Viettel Cyber Security for reporting.</span><br><br>"}],"value":"In Concrete CMS below version 9.4.8, a user with permission to edit a page with element Legacy form can perform a stored XSS attack towards high-privilege accounts via the Question field. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Thanks minhnn42, namdi and quanlna2 from VCSLab-Viettel Cyber Security for reporting."}],"impacts":[{"capecId":"CAPEC-592","descriptions":[{"lang":"en","value":"CAPEC-592 Stored XSS"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":4.8,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"HIGH","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"ff5b8ace-8b95-4078-9743-eac1ca5451de","shortName":"ConcreteCMS","dateUpdated":"2026-03-04T02:15:53.400Z"},"references":[{"url":"https://github.com/concretecms/concretecms/pull/12826"},{"url":"https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes"}],"source":{"advisory":"3451114","defect":["HackerOne"],"discovery":"EXTERNAL"},"title":"Concrete CMS below 9.4.8 is vulnerable to Stored XSS via Legacy form","x_generator":{"engine":"Vulnogram 0.5.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-04T15:32:45.974969Z","id":"CVE-2026-3240","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-04T15:33:21.842Z"}}]}}