{"items":[{"id":"NVI-00002603","kind":"vulnerability","title":"Concrete CMS does not validate a CSRF token before processing requests to `/dashboard/extend/update/prepare_remote_upgrade/`","revision":3,"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-5rj5-gfmr-hrc3","CVE-2026-8426"],"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-1f2c1194717ba804e6e8eb871d715995"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-04dd6a2283b3c3bc6ecc61b91ac381cc"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. 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Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-8426","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.386Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1f2c1194717ba804e6e8eb871d715995"],"technology":"concrete5/concrete5","known_exclusions":[],"conditions_summary":"Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/update/prepare_remote_upgrade/. An attacker who controls the remote package returned for a known marketplace item ID can overwrite the package PHP on disk and force its upgrade() method to execute in a single browser navigation. This results in remote code execution as the web server user.   In order to be vulnerable, the victim must be passing canInstallPackages, victim site must be connected to the Concrete marketplace; and the attacker controls the package returned for a marketplace item ID already installed on the victim site. The Concrete CMS security team thanks @maru1009 for reporting this issue.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 9.5.1"]}],"null_published_at":"2026-11-06T15:18:17.670Z","source_updated_at":"2026-09-10T03:51:04.687Z","source_disclosed_at":"2026-05-21T21:30:38.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:41:59.926Z"},{"id":"NVI-00002603","kind":"vulnerability","title":"Concrete CMS does not validate a CSRF token before processing requests to `/dashboard/extend/update/prepare_remote_upgrade/`","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-5rj5-gfmr-hrc3","CVE-2026-8426"],"plain_summary":"OSV carries this publisher advisory for concrete5/concrete5. 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Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-8426","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.386Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1f2c1194717ba804e6e8eb871d715995"],"technology":"concrete5/concrete5","known_exclusions":[],"conditions_summary":"Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/update/prepare_remote_upgrade/. An attacker who controls the remote package returned for a known marketplace item ID can overwrite the package PHP on disk and force its upgrade() method to execute in a single browser navigation. 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This results in remote code execution as the web server user.   In order to be vulnerable, the victim must be passing canInstallPackages, victim site must be connected to the Concrete marketplace; and the attacker controls the package returned for a marketplace item ID already installed on the victim site. The Concrete CMS security team thanks @maru1009 for reporting this issue.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 9.5.1"]}],"null_published_at":"2026-10-31T22:00:33.896Z","source_updated_at":"2026-09-10T03:51:04.687Z","source_disclosed_at":"2026-05-21T21:30:38.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:41:59.926Z"}],"next_cursor":null,"snapshot_revision":"42594"}