{"items":[{"id":"NVI-00002019","kind":"vulnerability","title":"Duplicate Advisory: TYPO3-CORE-SA-2026-021: Broken Access Control in Backend and Install Tool","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"withdrawn","identifiers":["GHSA-4f2f-jr2m-j7p4"],"plain_summary":"OSV carries this publisher advisory for typo3/cms-core, typo3/cms-core. 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 13.4.34 for typo3/cms-core. Confirm the publisher’s latest guidance.","source_ids":["sr-0837652f9083424d890ea3a338c0da7e"],"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":"The original advisory lists fixed boundaries 14.3.6 for typo3/cms-core. Confirm the publisher’s latest guidance.","source_ids":["sr-0837652f9083424d890ea3a338c0da7e"],"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}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0837652f9083424d890ea3a338c0da7e","url":"https://github.com/advisories/GHSA-4f2f-jr2m-j7p4","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-4f2f-jr2m-j7p4","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:41:49.668Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0837652f9083424d890ea3a338c0da7e"],"technology":"typo3/cms-core","known_exclusions":[],"conditions_summary":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-68jx-f42c-7599. This link is maintained to preserve external references.\n\n## Original Description\nThe referrer enforcement introduced with TYPO3-CORE-SA-2020-006 (CVE-2020-11069) became ineffective in TYPO3 v13.0, where TYPO3 CMS started serving the backend and Install Tool applications from the site's main entry script instead of the dedicated typo3/ directory.\n\nWhether a request originated from the backend or Install Tool itself was determined by comparing the referrer against the directory of the entry script, which since then is the site root. As a consequence, requests originating from any script running on one of the TYPO3 instance's own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.\n\nAttackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via Fetch/XHR with the privileges of an authenticated victim's user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.","public_affected_ranges":["ECOSYSTEM: introduced 13.0.0; fixed 13.4.34"]},{"certainty":"source_listed","source_ids":["sr-0837652f9083424d890ea3a338c0da7e"],"technology":"typo3/cms-core","known_exclusions":[],"conditions_summary":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-68jx-f42c-7599. This link is maintained to preserve external references.\n\n## Original Description\nThe referrer enforcement introduced with TYPO3-CORE-SA-2020-006 (CVE-2020-11069) became ineffective in TYPO3 v13.0, where TYPO3 CMS started serving the backend and Install Tool applications from the site's main entry script instead of the dedicated typo3/ directory.\n\nWhether a request originated from the backend or Install Tool itself was determined by comparing the referrer against the directory of the entry script, which since then is the site root. As a consequence, requests originating from any script running on one of the TYPO3 instance's own domains, such as a frontend page, were accepted by backend routes and Install Tool endpoints.\n\nAttackers able to execute JavaScript on one of those domains, for instance by exploiting a cross-site scripting vulnerability, could invoke these endpoints via Fetch/XHR with the privileges of an authenticated victim's user session. This issue affects TYPO3 CMS versions 13.0.0-13.4.33 and 14.0.0-14.3.5.","public_affected_ranges":["ECOSYSTEM: introduced 14.0.0; fixed 14.3.6"]}],"null_published_at":"2026-10-31T21:53:28.062Z","source_updated_at":"2026-09-01T21:45:23.112Z","source_disclosed_at":"2026-08-11T09:32:33.000Z","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":"2026-10-31T21:41:49.668Z"}],"next_cursor":null,"snapshot_revision":"44495"}