{"items":[{"id":"NVI-00018600","kind":"vulnerability","title":"JupyterHub has cross-origin form POSTs bypass XSRF (CWE-352)","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m68r-v472-jgq9","CVE-2026-40864"],"plain_summary":"GitHub lists this reviewed advisory for jupyterhub. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-426763704d1e340fe16d14bd28ce496a"],"action_type":"investigate","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":[{"kind":"CVSS","as_of":"2026-06-08T23:20:51.000Z","value":"5.4 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-426763704d1e340fe16d14bd28ce496a"}],"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-426763704d1e340fe16d14bd28ce496a","url":"https://github.com/advisories/GHSA-m68r-v472-jgq9","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m68r-v472-jgq9","publisher":"GitHub Advisory Database","observed_at":"2026-11-07T00:51:53.608Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-426763704d1e340fe16d14bd28ce496a"],"technology":"jupyterhub","known_exclusions":[],"conditions_summary":"## Summary\n\nJupyterHub's XSRF protection (updated in 4.1.0) inappropriately treated requests with `Sec-Fetch-Mode: no-cors` as same-origin requests, which they are not, bypassing XSRF checks. The JSON API is not affected, only HTTP form endpoints, such as `/hub/spawn` and `/hub/accept-share`, meaning attackers could trigger server spawn (but not access the server) and if the attacker is a JupyterHub user permitted to share access to their server, cause a user to accept a share and have access to the attacker's server.\n\n## Patches\n\nUpgrade to JupyterHub 5.4.5.\n\n## Mitigations\n\nIf a reverse proxy is in use, drop requests to JupyterHub with `Sec-Fetch-Mode: no-cors`.","public_affected_ranges":[">= 4.1.0, < 5.4.5"]}],"null_published_at":"2026-11-07T07:07:39.860Z","source_updated_at":"2026-06-08T23:20:51.000Z","source_disclosed_at":"2026-05-05T18:10:58.000Z","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":"2026-11-07T00:51:53.608Z"}],"next_cursor":null,"snapshot_revision":"42594"}