{"items":[{"id":"NVI-00006483","kind":"vulnerability","title":"Concrete CMS is vulnerable to IDOR in AddMessage/UpdateMessage","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-p8p9-5953-h9jw","CVE-2026-7886"],"plain_summary":"OSV carries this publisher advisory for concrete5/concrete5. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 9.5.1 for concrete5/concrete5. Confirm the publisher’s latest guidance.","source_ids":["sr-b68c17ccd99dbb542eab1813e73484f3"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. 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If a site truly has private files, the owner should set up a  private storage location https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-maintenance/files/file-storage-locations outside of the webroot so that permissions can be checked on view as well. 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This report has not examined your application.","related_sources":[{"id":"sr-b68c17ccd99dbb542eab1813e73484f3","url":"https://github.com/advisories/GHSA-p8p9-5953-h9jw","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-p8p9-5953-h9jw","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.988Z"},{"id":"sr-35b4b54c4c54cdec9c68524705479b55","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7886","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-7886","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T07:24:58.008Z"},{"id":"sr-79089fb1e1ce0eecb6a30741628e3069","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. 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If a site truly has private files, the owner should set up a  private storage location https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-maintenance/files/file-storage-locations outside of the webroot so that permissions can be checked on view as well. 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This report has not examined your application.","related_sources":[{"id":"sr-b68c17ccd99dbb542eab1813e73484f3","url":"https://github.com/advisories/GHSA-p8p9-5953-h9jw","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-p8p9-5953-h9jw","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.988Z"},{"id":"sr-35b4b54c4c54cdec9c68524705479b55","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7886","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-7886","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T07:24:58.008Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-b68c17ccd99dbb542eab1813e73484f3"],"technology":"concrete5/concrete5","known_exclusions":[],"conditions_summary":"Concrete CMS 9.5.0 and below is vulnerable to IDOR in AddMessage/UpdateMessage via attachments[] parameter which can lead to file permission bypass. The `AddMessage` and `UpdateMessage` conversation controllers accept user-supplied file attachment IDs and load files directly via `$em->find(File::class, $attachmentID)` without checking per-file permissions (`canViewFile()`). A user who can post in any conversation can reference any file in the CMS file manager by its sequential ID, effectively bypassing the file permission system. If a site truly has private files, the owner should set up a  private storage location https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-maintenance/files/file-storage-locations outside of the webroot so that permissions can be checked on view as well. 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A user who can post in any conversation can reference any file in the CMS file manager by its sequential ID, effectively bypassing the file permission system. If a site truly has private files, the owner should set up a  private storage location https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-maintenance/files/file-storage-locations outside of the webroot so that permissions can be checked on view as well. 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